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ThermApparel Cooling Vests

How does a cooling vest work?

A cooling vest works by lowering or stabilizing body temperature by absorbing some of the heat the body produces. Want more info? Read the whole blog.

Why does my body overheat?

Your body overheats when body heat can not dissipate faster than your body's core produces it. Did you know that when exercising, your body can create 15X more heat than at rest? Heat sensitivity occurs from the pace of generation, environmental factors, or both.

Simply put, your heart moves heat out to your skin, causing sweat, and as your sweat evaporates the result is cooling the skin. A higher temperature or humidity can inhibit the evaporation process, causing your body's core temperature to rise quickly.

What are the 4 different types of cooling vests?

  1. Evaporative - Must be worn wet, and can be slimy, and heavy.
  2. Ice - Can cause skin burns and hypothermia, condensation causes the garment to be wet and because it’s so cold it has to be worn on top of clothing.
  3. Cool Flow or Active - Must be connected to ice water and external pump. Works by pumping cold water through tubes in the garment.
  4. PCM (Phase Change Material) - ThermApparel’s Cooling Vest type. Won’t cause ice burn, won’t get you wet, has no tubes, and fast recharge time.

How does a cooling vest work?

A cooling vest works by lowering or stabilizing body temperature by absorbing some of the heat the body produces. Want more info? Read the whole blog.

How much does it weigh?

1.3 lbs - Vest Garment with 4 SlimCool Cooling Packs.
1.9 lbs - Vest Garment with 4 ExtendedCool Cooling Packs.

How Light is a ThermApparel UnderCool Cooling Vest - https://www.youtube.com/watch?v=KF0kYZL7dTA

How long does it last each time I use it?

ThermApparel UnderCool Cooling Vests provide comfortable cooling for 1-3 hours. SlimCool Cooling Packs average 1-2 hours, and ExtendedCool Cooling Packs average 2-3 hours. Cooling times vary depending on ambient temperatures and level of activity.

Watch Brad explain how long your ThermApparel Cooling Packs will last - https://youtu.be/Tdc52Wrbtis

Will it make me look funny?

Nope! When worn under your clothing your ThermApparel UnderCool Cooling Vest is almost invisible. It’s made to conform, bend and move with your body with its slim, low-profile design, lightweight 4-way stretch fabric, and flexible Cooling Packs. It’s up to you to let people know if you are wearing an UnderCool Cooling Vest or test them to see if they notice.

How to wear with summer tank tops, tshirts, and dresses - https://youtu.be/dsB_98y_epI

How to wear a Cooling Vest with summer tanks, tees, and suits - https://youtu.be/daOFLNsHkJI

Will people know I am wearing it?

Nope! When worn under your clothing your ThermApparel UnderCool Cooling Vest is almost invisible. It’s made to conform, bend and move with your body with its slim, low-profile design, lightweight 4-way stretch fabric, and flexible Cooling Packs. It’s up to you to let people know if you are wearing an UnderCool Cooling Vest or test them to see if they notice.

Is it uncomfortable?

Nope! Most people forget they have their ThermApparel UnderCool Cooling Vest on. It’s made to conform, bend, and move with your body with its slim, low-profile design, lightweight 4-way stretch fabric, and flexible Cooling Packs. With many sizes to choose from, we can guarantee the most comfortable fit possible. And if it doesn’t fit right, give us a call at 855-232-7233 and we will set up an exchange for a different size.

How to get the correct fit for UnderCool 3.0 - https://youtu.be/lAEnhyF0CsM

How to get the correct fit for UnderCool 2.0 - https://youtu.be/-3k4GrQjQAs

How many times can I wear it before purchasing a new one?

3-5 years for a Vest Garment, depending on how much you wear it and the care it is given.
3 years for Cooling Packs. After 3 years the Cooling Packs start to lose their cooling ability. They will still work but you will find that they don't last as long, the plastic wears down and they might leak.

If you have Cooling Packs that are over 3 years, this is the perfect time to use our recycling program and get a new set at a deeply discounted price.

For a more in-depth answer check out the blog How many years will my ThermApparel UnderCool Cooling Vest Last?

How many years will my ThermApparel UnderCool Cooling Vest last? - https://youtu.be/WhFZzhHUDEM

Why is ThermApparel the best cooling vest on the market?

The ThermApparel UnderCool Cooling Vest was designed from the ground up with help from people like you, people living with heat sensitivity. They told us they wanted a cooling vest that is: effective, comfortable, concealable, lightweight, easy to use, and helps with fatigue, cog fog, and inflammation. So that’s what we made!

Why does it cost more?

The simple answer is, that if it were cheaper it would not be as effective. Made in the USA, in Rochester NY, the ThemApparel UnderCool Cooling Vest embodies the highest quality with the best design and materials for your comfort and your body's safety.

The Cooling Packs will last 3 years before they need to be replaced so $199.99 ÷ 3 = $66 a year for cooling comfort, isn't too bad, and at 3 years, the cooling packs don't stop working, their cooling time starts to diminish. If you keep your Cooling Packs in their frozen state when not in use they should last 4 years, so $199.99 ÷ 4 = $49.99 a year. If you look at other cooling products on the market, many start at $50 and go up and will only last a few months or 1 use.

We wanted to create a product that was not 1-time use or a cooling pack that was cheaper but required our customers to purchase a few times a year. We wanted a product that was high quality, would last a few seasons, and would not fill up the landfill with 1-time use plastics.

The ThermApparel UnderCool Cooling Vest will not harm anyone. It's safe against hypothermia and ice burns on the skin, doesn’t have to be worn wet, and will not condensate, causing wet spots that feel and look bad. What value does a cheaper vest have? If it remains in your closet because you are too embarrassed to wear it, well, then it is of zero value.

Please look closely at all vests on the market before you buy, and keep your health and safety needs in mind when deciding if a ThermApparel UnderCool Cooling Vest is right for you.

Dave Bexfield of ActiveMSer’s has independently reviewed 20+ different cooling vests and has created an amazing Cooling Vest Guide. Check it out, it’s worth the read and will help you find the correct vest for you.

ThermApparel Cooling Packs

Why are ThermApparel Cooling Packs the best choice?

ThermApparel Cooling Packs use a combination of optimal materials and temperature to work with your body's ability to cool itself. We use Phase Change Material (PCM) because it freezes at a warmer temperature than ice and water. A warmer temperature is better for your body for several reasons.

  1. Won’t cause ice burns on your skin.
  2. Won’t condensate or sweat, causing wet spots.
  3. Works to maintain a lower core temperature.
  4. ThermApparel PCM is USDA-certified non-toxic and biodegradable.
  5. No hoses, wires, or electricity.
  6. Keeps a constant temperature of 70°F / 21°C to keep your body at an optimal temperature for 1-3 hours.
  7. Reusable and rechargeable.
  8. Works in high humidity.
  9. Lightweight and flexible.

Won’t make blood vessels constrict. Constricted blood vessels slow the dissipation of heat from the circulatory system by not allowing the blood to move through the body. Because ThermApparel Cooling Packs don’t constrict blood vessels, your blood is cooled as it passes the Cooling Packs and your body then pumps the cooled blood through your system cooling you down.

Why are they not as cold as other cooling packs?

Other companies' ice and gel packs, and some of the colder PCM packs, feel colder because they freeze at 32°F/0°C, but they are dangerous for your skin. You will have to wear a T-shirt between the other companies' cooling packs and your skin, so you don't experience ice burn—no T-shirt is needed with ThermApparel Cooling Packs.

The other companies' packs are so cold that they are not cooling as effectively. When they contact your skin, your blood vessels constrict. Constricted blood vessels slow the dissipation of heat from the circulatory system by not allowing the blood to move through the body. Because ThermApparel Cooling Packs don’t constrict blood vessels your blood is cooled as it passes the Cooling Packs, your body then pumps the cooled blood through your system cooling you down.

With our 70°F/21°C Cooling Packs, you will feel cool and comfortable at a temperature that feels natural to your skin and body. Your blood vessels won't constrict, your blood keeps flowing and your blood will cool, which will cool off your entire body instead of just the area where the ice or gel packs make contact. Our Cooling Packs help pull the heat out of your body, cooling you down. Our Cooling Packs are also safe against your skin and won’t cause ice burns like other ice and gel packs can.

What are the 4 different types of cooling vests?

  1. Evaporative - Must be worn wet, and can be slimy, and heavy.
  2. Ice - Can cause skin burns and hypothermia, condensation causes the garment to be wet and because it’s so cold it has to be worn on top of clothing.
  3. Cool Flow or Active - Must be connected to ice water and external pump. Works by pumping cold water through tubes in the garment.
  4. PCM (Phase Change Material) - ThermApparel’s Cooling Vest type. Won’t cause ice burn, won’t get you wet, has no tubes, and fast recharge time.

What is the difference between ExtendedCool and SlimCool?

ExtendedCool Cooling Packs
  • Thickness: .67" | 1.7cm
  • Weight Per Pack: 6.5oz | .18kg
  • Weight of Vest Garment and 4 ExtendedCool Packs: 1.9lb | .86kg
  • Cooling Time: 2-3 hours
SlimCool Cooling Packs
  • Thickness: .37" | .93cm
  • Weight Per Pack: 5oz | .14kg
  • Weight of Vest Garment and 4 SlimCool Packs: 1.3lb | .59kg
  • Cooling Time: 1-2 hours

Watch Julia explain the difference between ExtendedCool and SlimCool Cooling Packs and what they look like under clothing. - https://youtu.be/25ZxNd22wNU

What is PCM?

Phase Change Material (PCM) is a category used to describe various materials capable of storing and releasing large amounts of energy during the melting/freezing process, known as thermal dynamic properties. PCMs absorb and release thermal energy during this process. What does that mean? They absorb your body heat slowly over time to keep you cool and comfortable, even in humid environments. 

ThermApparel’s PCM is USDA-certified non-toxic and biodegradable. We chose it because it outperforms paraffin, salt hydrates, gel, and ice in several areas like:

  • long-term stability
  • sourced from recyclable materials
  • won’t get you wet or burn your skin
  • no dangerous oils or hard-to-clean paraffin waxes

Our lightweight and flexible PCM Cooling Packs are reusable, making them able to be recharged over and over again. Read more about PCM on our blog.

How do PCMs work?

PCMs are substances that absorb and release thermal energy during melting and freezing. In the case of our lightweight and flexible Cooling Packs, the PCM slowly absorbs your body heat over time to keep you cool and comfortable, even in humid environments.

Are PCMs safe?

Not all PCM's are created equal. ThermApparel’s PCM is USDA-certified non-toxic and biodegradable. We chose it because it outperforms paraffin, salt hydrates, gel, and ice in several areas such as long-term stability, sustainable materials, safety on the skin, and zero dangerous oils or hard-to-clean waxes. Our lightweight and flexible PCM Cooling Packs are reusable, making them able to be recharged over and over again. Read more info about PCM and see our safety data sheet for more info.

How do they recharge?

ThermApparel Cooling Packs will freeze in any environment under 70°F/21°C. Lay your Cooling Packs flat in ice water, the fridge, the freezer, a cold mountain stream, snow, or a hard cold surface in a cold room.

Recharging times:

  • 20 min ice water
  • 45 min freezer
  • 60 min fridge
  • 5 - 30 min for snow and cold mountain stream (depends on the temp of the snow and water)
  • 8-12 hours on a hard cold surface in a room below 70F / 21C

Watch Julia explain the 3 different ways you can recharge your ThermApparel Cooling Packs - https://youtu.be/4UlvymnxAZQ

Watch Brad explain how ThermApparel Cooling Packs recharge... and why you should eat Oreos on camera and try to talk. or in other words... Mom is right, don't eat and talk with your mouth full. - https://youtu.be/nk29Yx2J3i8

Do I have to soak them?

Nope. Your ThermApparel Cooling Packs don't need to be soaked like gel cooling packs.

Can they be left in the freezer?

Yes! The best place for prolonged storage of ThermApparel Cooling Packs is a freezer or fridge. Read our blog post about leaving your Cooling Packs in the freezer for more info.

Do you sell the Cooling Packs only?

Yes, you can purchase it in our shop.

Why do I need an extra set?

You need an extra set of ThermApparel Cooling Packs so you can extend the time you spend doing the things you love!

If you need to be in the heat or exercise longer than one set of ThermApparel Cooling Packs will last, you can replace your melted ThermApparel Cooling Packs with your second set for more cooling time.

Example: Say you are at a family function, like someone’s graduation celebration, during the summer out in a park in the heat. Once you start to overheat you would normally have to go sit in the car with the AC on or leave the party and go home. With an extra set of ThermApparel Cooling Packs, you can switch out the depleted set for the fresh set and keep enjoying the party with your family.

If you only have 1 set of ThermApparel Cooling Packs and are in this type of situation, take your depleted cooling packs and put them in the drink cooler. The ice water will refreeze them in 20 min. Then slide them back in your vest and keep enjoying the party.

Extra Cooling Pack Tip: Take a small cooler of ice water with you and leave your second set of ThermApparel Cooling Packs in the ice water. When you need to switch out they will be ready to go and you can recharge the expired set in about 20 min in the ice water.

How can I fix lumpy Cooling Packs?

If your ThermApparel Cooling Packs freeze in funny shapes don’t stress! It’s a quick and easy fix.

  1. Place a mixing bowl in your sink and run some warm water. Toss your ThermApparel Cooling Packs into the warm water and let them melt until they are squishy (you don’t have to melt them to liquid). You might have to change out the water as it gets cold or leave the faucet running.
  2. Once melted, lay them flat in ice water, the fridge, the freezer, a cold surface, or even the snow or a cold stream. (Ice Water Tip: Push them down to the bottom of the container so they lie flat.)
  3. Wait for them to refreeze - 20 minutes in ice water, 40 minutes in the fridge, 60 minutes in the freezer, overnight in a cold room lying on a hard surface, or 5-30 minutes in the snow or cold stream.
  4. After recharge, they will be flat and ready to go.

How do I care for my Cooling Packs?

Your ThermApparel Cooling Packs can take care of themselves. They don’t need to be “plumped or soaked” like gel cooling packs.

The best place to store your ThermApparel Cooling Packs is away from sunlight and in the “solid” state. A hot sunny spot would be the worst, like leaving them in the backseat of your car. The excess heat will cause the plastic to degrade over time.

Clean your ThermApparel Cooling Packs with mild soap and water. Store them in the fridge or freezer if you are not going to use them for a while. Read our blog post about the long-term storage of your ThermApparel Cooling Packs for more info.

Are they recyclable?

Yes! ThermApparel Cooling Packs are recyclable and you can recycle them anytime you like! We recommend recycling after 3-4 years of use. When you are ready to get new packs, use the recycling program. It’s an easy way to get a new set of ThermApparel Cooling Packs at a reduced price.

Can I take them in a cooler to my event?

First, check with the venue to see what their rules are regarding outside coolers. Other than that, yes, taking a cooler with ice water with you is always a good idea, and you can use it to refreeze the cooling packs in 20 to 30 minutes.

Tip: Keep your ThermApparel UnderCool Cooling Vest and extra Cooling Packs in the freezer until you are ready to depart. Place your ThermApparel UnderCool Cooling Vest and extra Cooling Packs in a cooler and go where you need to go. The cooler will keep your ThermApparel UnderCool Cooling Vest cold until you get to your event.

If you need your ThermApparel UnderCool Cooling Vest and extra Cooling Packs to stay cold for a few hours before you use them, use a cooler that has ice packs or ice water to help keep your ThermApparel UnderCool Cooling Vest and Cooling Packs cold.

Tip from our customer Ben: If you can’t take a cooler take a large 2-3 gallon Ziplock type bag with you. Ask the food vendors for ice water or go to the paramedic / first aid tent. Tell them about your situation and heat sensitivity and that you need ice water to recharge your ThermApparel Cooling Packs. They should be able to help you. Read and watch Ben's testimonial.

How long do they last?

SlimCool Cooling Packs average 1-2 hours.
ExtendedCool Cooling Packs average 2-3 hours.
Cooling times vary depending on ambient temperatures and level of activity.

Watch Brad explain how long your ThermApparl UnderCool Cooling Packs will last - https://youtu.be/Tdc52Wrbtis

How tough are they?

In their frozen state, the Cooling Packs are pretty tough. In their liquid state... not so much, ahh science and displacement. 

Watch Kurtis and Brad demonstrate how tough ThermApparel Cooling Packs really are. FYI, the guys use a hummer... cool - https://youtu.be/nGRKJ79lOz4

ThermApparel Vest Garments

How does the Vest Garment Work?

The job of the ThermApparel Vest Garment is to securely hold the Cooling Packs to your body. The ThermApparel Vest Garment is made to conform, bend, and move with your body with its slim, low-profile design, lightweight 4-way stretch fabric, wicking fabric to keep you dry, and mesh panels for maximum breathability.

The ThermApparel Vest Garment has velcro on the front panels for easy on and off, adjustable straps for a comfortable fit, and with many different sizes, it can accommodate the waist of any user.

The ThermApparel Vest Garment can be worn both under and over clothing, according to your preference. We recommend wearing it under your clothes for optimal and maximum cooling.

ThermApparel Cooling Packs keep a constant temperature of 70°F/21°C to keep your body at an optimal temperature for 1-3 hours.

The combination of the ThermApparel Vest Garment and Cooling Packs makes for the best-fitting vest on the market.

How do I find the correct size?

  1. Stand or sit up straight and tall.
  2. Bend at both sides, like the “I am a Little Teacup” song as a kid... “Tip me over and pour me out.”
  3. Measure where you bend and measure 2-3 times to get the average. If you don’t bend, measure below the rib cage but above your belly button.
  4. Check our sizing guide for correct sizing, or order a complimentary FitKit to get a tape measure for the perfect fit.

Tips:

  • Sizing is based on your natural waist, not your hips, bust, shirt, or pant size.
  • Measure against your skin.
  • Take your measurements in front of a mirror.
  • Make sure your tape measure is level on both sides.
  • The Vest Garment needs to fit your body like a glove to give you the best cooling support.
  • If you are in between 2 sizes, order the smaller size.
  • You will wear a size smaller than you think.

Please refer to our sizing guide for correct sizing, or order a complimentary FitKit to get a tape measure for the perfect fit.

Watch Julia explain how to get the correct size for the 3.0 UnderCool: https://youtu.be/lAEnhyF0CsM

Do you sell the Vest Garment only?

Yes, you can purchase it in our shop.

Can I wear it over my shirt?

Yes, but we recommend wearing it under your shirt for the maximum cooling benefit.

Is there a difference between Mens and Womens?

The ThermApparel Vest Garment is unisex. It comes in many different sizes to fit a wide variety of body shapes and sizes because “one size fits all” really isn’t accurate. The ThermApparel Vest Garment needs to fit your body like a glove to give you the best cooling support. Check out our sizing tips and sign up for a free FitKit.

Are my straps too long?

The straps are long to accommodate the difference in people's torso length. The function of the straps is to reduce bounce during activities like running. If you are not participating in a vertical motion, just adjust to where the straps are the most comfortable or try wearing it without the straps. Tuck them in or let them hang loose, either way, you will stay cool.

Who ThermApparel UnderCool Cooling Vests Help

Who benefits?

Everyone! Who wouldn’t want less fatigue, more concentration, and faster recovery from the heat?! Seriously, ThermApparel UnderCool Cooling Vests will help anyone who is uncomfortable in the heat or experiences poor performance due to higher environmental or core temperatures and heat sensitivity.

  • People living with health conditions like MS, Lupus, POTS, Hyperthyroidism, and other neurological disorders.
  • People taking medications like allergy, blood pressure, decongestants, antidepressants, antibiotics, and acne meds.
  • People who drink caffeine, energy drinks, and coffee.
  • People that work in hot environments.

Tip: Please be careful of daily repeated exposure to heat over long periods. Studies have found irreversible kidney damage and death.

What are the physical benefits?

  • Lengthens the time it takes for your body to overheat
  • Less stress on the heart to expel the body's heat to the skin
  • Less fatigue
  • Improves concentration

I have Lupus. Will UnderCool work for me?

Yes! If you have heat sensitivity issues due to Lupus, a ThermApparel UnderCool Cooling Vest could work for you. LupusChick has been putting hers to the test for us, and she loves it. Read her review, or better yet, check out our blog post about Lupus, heat sensitivity, and how ThermApparel Cooling Vests help.

I have POTS. Will UnderCool work for me?

Yes! If you have heat sensitivity issues resulting from POTS, a ThermApparel UnderCool Cooling Vest could work for you. Chronically Salty has been putting hers to the test, and she loves it. Watch her unboxing video and her concert survival tips video. Or check out Unstrung Studios' review and check out her amazing artwork.

Can I wear it under my Santa suit?

Yes! Santa Ed Taylor of Worldwide Santa Network and Santa Rick Rosenthal of Northern Lights Santa Academy, two of our nation's top real-bearded Santas, reviewed the ThermApparel UnderCool Cooling Vest. Check out our Santa page for all reviews and resources for keeping Santa cool.

Don’t just take our word for it...

Santa Ed Taylor - Worldwide Santa Claus Network

Santa Michael - Mitten State Santa

Santa Val - ThermApparel Cooling Vest Saved My Life!

Santa Jim - Keeping Cool at the mall

Who will be our next Santa??? Will it be you?

We would love to know about your experience with the UnderCool Cooling Vest. Send us your testimonial. 

Can I wear it under a costume for theatre or movies?

Yes! The concealable feature of the ThermApparel Cooling Packs being located on the lower back makes it the ideal cooling option for tight-fitting
costumes for singers and actors. You might have seen ThermApparel UnderCool Cooling Vests in action and didn’t even know it. Our Vests have been used on major TV shows. Check it out here! 

Can I wear it under my fire suit in my racecar?

Yes! Watch Kurtis explain how it works, which cooling pack would be best for you, and how it fits with your seat and safety concerns - https://youtu.be/8zPwCM6XjZ0

Watch Charlie Boehly's testimonial of the ThermApparel UnderCool 2.0 Cooling Vest at Watkins Glenn International while racing Spec Miata - https://youtu.be/1SiSXtUFYOE

What is heat intolerance?

Heat intolerance is an unusual sensitivity to heat. People with heat intolerance may feel hot when others feel comfortable or cold. They may also have unusual responses to heat, such as intense sweating or anxiety.

Heat intolerance is a feeling of being overheated when the temperature around you rises. Heat intolerance usually comes on slowly but may also occur quickly and could be a serious illness. Once the sensitivity develops, the side-effects of exhaustion, cog fog, etc., can last a few days.

What are the symptoms of heat intolerance?

  • Fatigue
  • Confusion
  • Exhaustion
  • Headache
  • Dizziness
  • Weakness
  • Muscle Cramping
  • Nausea

Who suffers from heat intolerance and what causes it?

Everyone suffers from heat stress if they get too hot. Those who are more prone to heat stress have heat sensitivity, and those whose function and performance decrease when they're hot have heat intolerance. The loss in performance and function is triggered by internal, external, and situational heat. Check out our blog on Crafting a Personalized Cooling Plan for more info.

  • Age: Infants, children under 4 years old, and older adults may be more sensitive to heat. This sensitivity increases their susceptibility to heat-related illnesses, such as heat stroke.
  • Medication: Some medications change the body’s response to heat by decreasing sweat production. Anticholinergic drugs, which can treat many psychiatric conditions and Parkinson’s disease, and some medications that treat allergies, blood pressure, decongestants, antidepressants, antibiotics, and acne may reduce sweating and increase heat sensitivity.
  • Sensory issues: Sensory processing disorder, as well as sensory issues that sometimes accompany autism, may make a person more sensitive to heat.
  • Neurological conditions: Medical conditions that affect the brain and spinal cord, such as spinal cord injuries, MS, POTS, Lupus, and Fibromyalgia, can increase heat sensitivity by changing how the body or brain processes heat or by inhibiting the body’s ability to regulate temperature.
  • Endocrine system problems: The endocrine system helps the body regulate a wide range of functions. Disorders such as Graves’ disease, a thyroid condition, can increase heat sensitivity.
  • Being less physically fit: For some people, heat intolerance is a sign of poor cardiovascular and respiratory fitness. In 2014, researchers found that people who showed more signs of heat intolerance were also less physically fit.
  • Internal: The body doesn’t react well to heat due to internal reasons like chronic illness, medications, allergies, diet, or hyperthyroid issues.
  • External: Hot or humid conditions above what our bodies are usually conditioned to. Keep in mind that on a hot day, your body temperature varies dramatically worldwide. Examples: firefighters, factories, actors on-stage, machine operation, cooks, etc.. or even a warm day in Alaska compared to one in India.
  • Situational: Clothing and protective clothing create situations that can make our bodies overheat and experience heat stress, heat sensitivity, or decreased performance. Especially when 100% of the body is covered. Examples: Costumes, race car driving, mascots, beekeepers.

Troubleshooting

Why doesn't my UnderCool seem cold?

You might have the wrong size. Sometimes if the vest is too large, you won't get optimal cooling. If you think your vest is too large, give us a call so we can set up a free exchange (855-232-7233).

Questions to ask yourself.

  • Does the Vest Garment feel snug like it's hugging you?
  • Do the Cooling Packs sit firmly on your lower back?
  • Is there complete contact with no gaps between the Vest Garment and your back? The Cooling Packs need to make contact with your skin and not an undergarment for optimal cooling.
  • One way to check is to sit down on the couch with your ThermApparel UnderCool Cooling Vest on.
  • Is there a big difference in the cooling sensation?
  • Can you feel more of the Cooling Packs on your back?
  • If you answered yes, you most likely need a smaller size.

Contact us to set up a free exchange (855-232-7233).

Watch Julia explain how to do an exchange or return - https://youtu.be/JR7qD1FW4nA

Why don't my Cooling Packs feel cold?

Even though they don't feel cold, they are still working. If your ThermApparel Cooling Packs are still in a semi-solid state (meaning you can’t see through the entire pack), they are still pulling heat from your core and cooling you down. Feel the skin on your back. Is it cold? If not you might have the wrong size and need to do an exchange.

The main reason why your vest may not feel "cold" is because ThermApparel Cooling Packs melt and freeze at 70°F/21°C. Example: Think of jumping in a swimming pool with a water temperature of 70°F/21°C. At first, it will be frigid, but after swimming for a little while, your body will adjust, and it doesn't feel as cold, but the water temperature has not changed. It has to do with the amount of coolness. Think of washing your hands in water at 70°F/21°C. Now think of taking a shower with water at 70°F/21°C. Burr!

Try doing the same activities with and without your ThermApparel UnderCoolCooling Vest and take notice of the differences. Compare your fatigue and cog fog levels. After you take the vest off, touch your back. Is it cool? Does the cooling effect last a while even though you are not wearing the vest?

Our ThermApparel cooling vests will cool down your internal body temperatures without constricting your blood vessels or burning your skin, making for a full range of movement and more energy to spend on the things that you love.

It's not about feeling cold, it's about feeling good.

Will it "sweat" or will I feel "wet"?

The PCM in ThermApparel Cooling Packs is sealed in heavy-duty industrial plastic. While the PCM does melt as it absorbs heat, the liquid PCM is kept within the Cooling Pack. The Cooling Packs will not melt like ice and gel packs which can condensate and get you wet or cause wet spots on your clothing.

If you experience any wetness, remove the packs as this could be a leak. The PCM is USDA-certified non-toxic, biodegradable, and will not harm you but may stain your clothes. Check out our cleaning blog for more information.

If you do experience a leak please take a couple of close-up photos of the broken pack, clean up the PCM and give us a call at 855-232-7233. We will want to see the photos of the broken pack and will want to know what you were doing when the pack broke.

How do I insert the cooling packs?

ThermaApparel Cooling Packs are all the same size and fit into all sizes of the ThermApparel Vest Garments. Here are a few tips to help get the packs into your Vest Garment:

  1. Make sure the Cooling Packs are solid/frozen.
  2. Lay your Vest Garment on a flat surface in front of you with the cooling packs above the pockets easily in reach.
  3. Lean over your Vest Garment and place your forearms on either side of one of the pockets.
  4. Using slight pressure with your forearms, pull the fabric in opposite directions. This will allow the pocket to be wider than the Cooling Pack.
  5. While maintaining pressure and pulling the fabric in opposite directions, use your left finger to pull open the pocket. Use your right fingers to slide the Cooling Pack into the vest.
  6. Let go.
  7. Repeat the process with the other three pockets.

You can also read and view our blog on how to insert the cooling packs.

Watch Julia explain how to insert your cooling packs - https://youtu.be/q8gsw20dBow

What do I do if my Cooling Packs look damaged?

Take a couple of close-up photos of the broken pack, clean up the PCM, and give us a call at 855-232-7233. We will want to see the photos of the broken pack and will want to know what you were doing when the pack broke.

If your Cooling Packs are within the 1-year warranty and the damage was caused by a manufacturing defect we will replace them. If you are beyond the 1-year warranty or if the Cooling Pack broke from its normal lifetime usage or negligence this is a great opportunity to use our recycling program and get a new set of Cooling Packs at a deeply discounted price!

The PCM can be cleaned up with Dawn dish soap, and you can clean your Vest Garment with the same Dawn soapy water or Shout Laundry Stain Remover. If you have questions, read more on our cleaning blog.

What do I do if a Cooling Pack breaks?

Take a couple of close-up photos of the broken pack, clean up the PCM, and give us a call at 855-232-7233. We will want to see the photos of the broken pack and will want to know what you were doing when the pack broke. 

If your Cooling Packs are within the 1-year warranty and the damage was caused by a manufacturing defect we will replace them. If you are beyond the 1-year warranty or if the Cooling Pack broke from its normal lifetime usage or negligence this is a great opportunity to use our recycling program and get a new set of Cooling Packs at a deeply discounted price! 

The PCM can be cleaned up with Dawn dish soap, and you can clean your PCM off of your Vest Garment with the same Dawn soapy water or Shout Laundry Stain Remover. If you have questions, read more on our cleaning blog. 

How do I clean up a broken Cooling Pack?

The PCM can be cleaned up with Dawn dish soap or anything you would use to clean up vegetable oil, and you can clean your Vest Garment or clothes of any PCM with the same Dawn soapy water or Shout Laundry Stain Remover. If you have questions, read more on our cleaning blog.

Why are the Cooling Packs so hard to insert?

ThermaApparel Cooling Packs need to be held snuggly In the Vest Garment so they don't move around or slouch down to the bottom of the vest once they deplete. The tight pockets keep the Cooling Packs in place and in contact with your lower back for maximum cooling. Here are a few tips to help get the packs into your Vest Garment:

  1. Make sure the Cooling Packs are solid/frozen.
  2. Lay your Vest Garment on a flat surface in front of you with the cooling packs above the pockets easily in reach.
  3. Lean over your Vest Garment and place your forearms on either side of one of the pockets.
  4. Using slight pressure with your forearms, pull the fabric in opposite directions. This will allow the pocket to be wider than the Cooling Pack.
  5. While maintaining pressure and pulling the fabric in opposite directions, use your left finger to pull open the pocket. Use your right fingers to slide the Cooling Pack into the vest.
  6. Let go.
  7. Repeat the process with the other three pockets.

You can also view our video on how to insert the cooling packs.

Ordering

What do I need to know before ordering?

Read our blog 4 Things to Decide Before Ordering Your UnderCool Cooling Vest.

My waist measurement is in between two sizes. Which size should I order?

Watch Julia explain how to get the correct sizing for UnderCool 3.0 - For a 3.0 go with the larger size - https://youtu.be/lAEnhyF0CsM

Watch Julia explain how to get the correct size for UnderCool 2.0. - For a 2.0 go with the smaller size - https://youtu.be/-3k4GrQjQAs

Where can I try on UnderCool?

You can come to our offices in Rochester, NY. We would be happy to see you! Call 855-232-7233 to set up an appointment. We have a reseller in Australia too! Stop into RehaCare. You can try one there too. Our vest is also available for fitting in select clinics around the country; ask your Neurologist or local nonprofit organization. If your local clinic doesn’t have a demo vest, have them get in touch with us. We can send them one.

Do you ship outside the USA?

Yes! If you have an address that DHL, FedEx, or USPS International delivers to, we can ship directly to you.

If you live in Australia or New Zealand, please purchase your vest through RehaCare. To figure out your shipping costs go through the motions of placing your order. After you enter your shipping address the next page will show your shipping options. Please note that the shipping price does not include VAT Tax, Duties, or any other charges your country's customs will charge.

What does shipping cost?

It's FREE for orders over $90 that are shipping to a USA address.

For other countries or express services, it depends on where it’s going and how fast you want it to get there. If you have an address that DHL, FedEx, or USPS International delivers to, we can ship directly to you. You will see these options when you're in the shipping stage of checkout.

If you live in Australia or New Zealand, please purchase your vest through RehaCare. To figure out your shipping costs go through the motions of placing your order. After you enter your shipping address the next page will show your shipping options. Please note that the shipping price does not include VAT Tax, Duties, or any other charges your country's customs will charge.

Do you sell the Vest Garment only?

Yes, you can purchase it in our shop.

Do you sell the Cooling Packs only?

Yes, you can purchase it in our shop.

What if the ThermApparel UnderCool Cooling Vest just doesn't work for me?

Did your vest seem too big or it didn’t keep you cool? You might have the wrong size. Call us at 855-232-7233 and let’s talk to make sure you have the right size and the right cooling packs or if we need to set up an exchange or return. Visit our returns and exchanges page for complete details.

How do set up an exchange?

Need a different size or color? Call us at 855-232-7233, so we can email you the exchange form and a USPS pre-paid shipping label. You can drop off your return at any USPS Postal Service™ facility or mail it directly from your home. No printer? We can mail the label to you. Visit our returns and exchanges page for complete details.

Watch Julia explain how to set up an exchange or return - https://youtu.be/JR7qD1FW4nA

How do set up a return?

We’re sorry your purchase didn’t work out for you. Call us at 855-232-7233 so we can email you the return form and a USPS pre-paid shipping label. You can drop off your return at any USPS Postal Service™ facility or mail it directly from your home. No printer? We can mail the label to you. 

Please note that $10.50 will be deducted from your refund to cover return shipping when your return is mailed using the provided USPS pre-paid shipping label. Visit our returns and exchanges page for complete details.

Watch Julia explain how to set up an exchange or return - https://youtu.be/JR7qD1FW4nA

Financial Aid & Health Insurance

I can’t afford it, what should I do?

Many foundations and organizations have financial assistance programs and if you qualify, they may be able to help. Check out our Financial Assistance Page for more details and contact info.

Is it covered by Insurance?

It depends on your insurance provider and your individual plan. Check out our insurance page to read more about the process.

Care of your ThermApparel UnderCool Cooling Vest

Is it machine washable?

Yes! The ThermApparel Vest Garment is washer safe. Use a wash bag to keep the velcro from snagging or attaching itself to the rest of your laundry. 

No! The ThermApparel Cooling Packs are NOT machine washable. (Trust us on this one. We've tried it, and they won't make it. Also, we won't replace any packs that have been through the washer.) Check out our cleaning blog for more information. 

Watch Julia explain how to care for your ThermApparel UnderCool Cooling Vest - https://youtu.be/FIW6oagDRSA

How do I care for my Cooling Packs?

Your ThermApparel Cooling Packs can take care of themselves. They don’t need to be “plumped or soaked” like gel cooling packs. 

The best place to store your ThermApparel Cooling Packs is away from sunlight and in the “solid” state. A hot sunny spot would be the worst,
like leaving them in the backseat of your car. The excess heat will cause the plastic to degrade over time.

Clean your ThermApparel Cooling Packs with mild soap and water. Store them in the fridge or freezer if you are not going to use them for a while. Read our blog post about the long-term storage of your ThermApparel Cooling Packs for more info.

Can I wear a bra?

Yes, you can wear a bra, sports bra, or no bra with your UnderCool. They are designed to fit women comfortably, unlike the industrial cooling vests made for men. UnderCool will not get in the way of your breasts, bra, or no bra of choice.

How to wear with summer tank, tops, tshirts, and dresses - https://youtu.be/dsB_98y_epI

Can I take it on a plane?

Possibly, by being prepared with the proper TSA guidelines ahead of time. Read our blog for tips, guidelines, and downloads from the TSA

Watch Julia explain how to take your ThermApparel UnderCool Cooling Vest on a plane - https://youtu.be/oCT_WXkl90Q

I am going camping with no electricity. How do I recharge the Cooling Packs?

Bring a big plastic bag with you - when you need to recharge your packs, fill the bag halfway with ice and water and lay your packs flat in the bag.* They will recharge fully in 20-30 mins! You can also put them in the drink cooler.

If you find a cold stream, dip the packs in the cold water for 20 minutes - just don’t lose them in the stream. Tip: Use a net laundry bag to place the packs in the river.

*Just Ice will not work as fast, it needs to be ice water so that the packs are fully submerged in the cold temperature.

How To...

How do set up an exchange?

Need a different size or color? Call us at 855-232-7233, so we can email you the exchange form and a USPS pre-paid shipping label. You can drop off your return at any USPS Postal Service™ facility or mail it directly from your home. No printer? We can mail the label to you. Visit our returns and exchanges page for complete details.

Watch Julia explain how to set up an exchange or return - https://youtu.be/JR7qD1FW4nA

How do set up a return?

We’re sorry your purchase didn’t work out for you. Call us at 855-232-7233 so we can email you the return form and a USPS pre-paid shipping label. You can drop off your return at any USPS Postal Service™ facility or mail it directly from your home. No printer? We can mail the label to you.

Please note that $10.50 will be deducted from your refund to cover return shipping when your return is mailed using the provided USPS pre-paid shipping label. Visit our returns and exchanges page for complete details.

Watch Julia explain how to set up an exchange or return - https://youtu.be/JR7qD1FW4nA

How do I insert the cooling packs?

ThermaApparel Cooling Packs are all the same size and fit into all sizes of the ThermApparel Vest Garments. Here are a few tips to help get the packs into your Vest Garment:

  1. Make sure the Cooling Packs are solid/frozen.
  2. Lay your Vest Garment on a flat surface in front of you with the cooling packs above the pockets easily in reach.
  3. Lean over your Vest Garment and place your forearms on either side of one of the pockets.
  4. Using slight pressure with your forearms, pull the fabric in opposite directions. This will allow the pocket to be wider than the Cooling Pack.
  5. While maintaining pressure and pulling the fabric in opposite directions, use your left finger to pull open the pocket. Use your right fingers to slide the Cooling Pack into the vest.
  6. Let go.
  7. Repeat the process with the other three pockets.

You can also read and view our blog on how to insert the cooling packs.

Watch Julia explain how to insert your cooling packs - https://youtu.be/q8gsw20dBow

How do I find the correct size?

  1. Stand or sit up straight and tall.
  2. Bend at both sides, like the “I am a Little Teacup” song as a kid... “Tip me over and pour me out.”
  3. Measure where you bend and measure 2-3 times to get the average. If you don’t bend, measure below the rib cage but above your belly button.
  4. Check our sizing guide for correct sizing, or order a complimentary FitKit to get a tape measure for the perfect fit.

Tips:

  • Sizing is based on your natural waist, not your hips, bust, shirt, or pant size.
  • Measure against your skin.
  • Take your measurements in front of a mirror.
  • Make sure your tape measure is level on both sides.
  • The Vest Garment needs to fit your body like a glove to give you the best cooling support.
  • If you are in between 2 sizes, order the smaller size.
  • You will wear a size smaller than you think.

Please refer to our sizing guide for correct sizing, or order a complimentary FitKit to get a tape measure for the perfect fit.

Watch Julia explain how to get the correct size for the 3.0 UnderCool: https://youtu.be/lAEnhyF0CsM

How to fix lumpy Cooling Packs?

If your ThermApparel Cooling Packs freeze in funny shapes don’t stress! It’s a quick and easy fix.

  1. Place a mixing bowl in your sink and run some warm water. Toss your ThermApparel Cooling Packs into the warm water and let them melt until they are squishy (you don’t have to melt them to liquid). You might have to change out the water as it gets cold or leave the faucet running.
  2. Once melted, lay them flat in ice water, the fridge, the freezer, a cold surface, or even the snow or a cold stream. (Ice Water Tip: Push them down to the bottom of the container so they lie flat.)
  3. Wait for them to refreeze - 20 minutes in ice water, 40 minutes in the fridge, 60 minutes in the freezer, overnight in a cold room lying on a hard surface, or 5-30 minutes in the snow or cold stream.
  4. After recharge, they will be flat and ready to go.

How to store in the off-season

Read our blog post about the long-term storage of your ThermApparel Cooling Packs for more info.

How to store cooling packs - https://youtu.be/MXuGmbF16ek

How to get the most benefit.

The best way to use any cooling product is to use it before you overheat. The trick to not overheating is keeping your core temperature from rising too high. Use your UnderCool Cooling Vest before you do something strenuous or before you go out into the heat. Then use it in the heat or during any activity that makes you sweat.

Post-cooling is often overlooked, but using your UnderCool Cooling Vest to help bring your core temp back to a normal range promotes less fatigue and faster recovery.

  1. Before going into the heat or participating in strenuous activity.
  2. During activity or exposure to the heat.
  3. Cooling down after for faster recovery.