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User Guide

For UnderCool, RallyWrap, UltraCool

Getting Started

These products all use our 70F/21C cooling packs.  These cooling packs are interchangable between these products.

Download a print-friendly version of our User Guide. 

  • You don’t have to remove the cooling packs from the vest to charge them. Put the whole vest with packs included into the freezer or fridge for 45 to 60 minutes (or ice water for 20 minutes) until they are fully solid again.
  • If you take the packs out of the vest, slide the frozen cooling packs into each of the pockets in the back of your ThermApparel UnderCool Cooling Vest.
  • Your UnderCool is now charged and ready to be worn.

TIPS:

  • Cooling packs can be stacked but will take longer to freeze.
  • Make sure the cooling packs lie flat or they will freeze into strange shapes.
  • If cooling packs freeze in strange shapes run warm water over them until they are squishy. Reshape. Lie flat. Refreeze.

How to Wear

  • Unfasten the Velcro.
  • Place your arms through each armhole.
  • Fasten the Velcro on your front, tight enough so the cooling packs rest firmly on your back.
  • Wear whatever you like over your UnderCool and enjoy a day safe from the heat.

How to Tell if You Have the Right Fit

  • Your ThermApparel UnderCool Cooling Vest should fit your body like a glove with no space between your back and the cooling packs. 
  • Watch our sizing video for tips on getting the right fit.
  • Think you have the wrong size and want to exchange it? Start at Exchanges and Returns.

Cooling & Recharging

  • Your ThermApparel UnderCool Cooling Vest will cool as long as the packs haven't phased to complete liquid - this may occur in 1-3 hours depending on your level of activity and the ambient temperature.
  • To recharge the packs, put them back in the freezer or fridge for 45 to 60 minutes (or ice water for 20) until they are fully solid again.
  • Cooling packs can be stacked but will take longer to freeze. 
  • Make sure the cooling packs lie flat or they will freeze into strange shapes.
  • If cooling packs freeze in strange shapes run warm water over them until they are squishy. Reshape. Lay flat. Refreeze.

Washing & Care of Garment 

Machine Wash

  • Remove all cooling packs from the vest.
    (They will be destroyed if you keep them in there! Trust us, we tried it
    and it's not pretty.)
  • Secure the velcro so it won't snag and place it in a small net laundry bag.
  • Wash UnderCool in cold water with like colors.
  • Lay flat to air dry and store flat. (If it goes into the dryer don't panic, you haven't destroyed your vest garment. The dryer just shortens the
    life of the spandex.)

Hand Wash

  • Cooling Packs can stay in the vest garment. 
  • Hand wash with mild soap.
  • Rinse well.
  • Lay flat on a towel to air dry.

Storage of Cooling Packs

  • Do not leave cooling packs in a hot car or hot environment.
  • To get the most out of your cooling packs, keep them frozen when not in use. This can be done by leaving them in the freezer, fridge, or
    anywhere colder than 70°F/21°C. (The cooling packs can hang out in the fridge or freezer for years. It's ok.) 
  • Cooling packs will last for 2-3 years depending on usage.
  • Cooling Packs left in their melted state for extended periods of time will reduce lifespan.
  • To wash your cooling packs, use warm soapy water in the sink.  DO NOT put cooling packs in your washer, dryer, or dishwasher. (They will be destroyed! Trust us, we tried it and it's not pretty.)
  • For discounts on replacement packs, check out our Recycling Program.

For CoolSleeves

Getting Started

This product uses 66F/19C cooling packs.  

Download a print-friendly version of our User Guide.

  • You don’t have to remove the cooling packs from the vest to charge them. Put the whole product with packs included into the freezer or fridge for 45 to 60 minutes (or ice water for 20 minutes) until they are fully solid again.
  • If you take the packs out of the sleeves, slide the frozen cooling packs into each of the pockets.
  • Your CoolSleeves are now charged and ready to be worn.

TIPS:

  • Cooling packs can be stacked but will take longer to freeze.
  • Make sure the cooling packs lie flat or they will freeze into strange shapes.
  • If cooling packs freeze in strange shapes run warm water over them until they are squishy. Reshape. Lie flat. Refreeze.

How to Wear

  • Place your hands through each armhole.
  • Slide up your arm until it is in the position you like.
  • Your CoolSleeves should fit your body like a glove with no space between your skin and the cooling packs. 
  • If the sizing is not right for you. Please let us know. We are looking at adding new sizes of this product.

Cooling & Recharging

  • Your ThermApparel CoolSleeve will cool as long as the packs haven't phased to complete liquid - this may occur in 30 to 45 min depending on your level of activity and the ambient temperature.
  • To recharge the packs, put them back in the freezer or fridge for 45 to 60 minutes (or ice water for 20) until they are fully solid again.
  • Cooling packs can be stacked but will take longer to freeze. 
  • Make sure the cooling packs lie flat or they will freeze into strange shapes.
  • If cooling packs freeze in strange shapes run warm water over them until they are squishy. Reshape. Lay flat. Refreeze.

Washing & Care of Garment 

Machine Wash

  • Remove all cooling packs from the vest.
    (They will be destroyed if you keep them in there! Trust us, we tried it
    and it's not pretty.)
  • Secure the velcro so it won't snag and place it in a small net laundry bag.
  • Wash UnderCool in cold water with like colors.
  • Lay flat to air dry and store flat. (If it goes into the dryer don't panic, you haven't destroyed your vest garment. The dryer just shortens the
    life of the spandex.)

Hand Wash

  • Cooling Packs can stay in the vest garment. 
  • Hand wash with mild soap.
  • Rinse well.
  • Lay flat on a towel to air dry.

Storage of Cooling Packs

  • Do not leave cooling packs in a hot car or hot environment.
  • To get the most out of your cooling packs, keep them frozen when not in use. This can be done by leaving them in the freezer, fridge, or
    anywhere colder than 70°F/21°C. (The cooling packs can hang out in the fridge or freezer for years. It's ok.) 
  • Cooling packs will last for 2-3 years depending on usage.
  • Cooling Packs left in their melted state for extended periods of time will reduce lifespan.
  • To wash your cooling packs, use warm soapy water in the sink.  DO NOT put cooling packs in your washer, dryer, or dishwasher. (They will be destroyed! Trust us, we tried it and it's not pretty.)
  • For discounts on replacement packs, check out our Recycling Program.

For Headband

Getting Started

This product uses Patent Pending FlexCool66 Cooling Packs. These packs should be frozen in the fridge or icewater.

Freezing Headband in the freezer WILL result in a unflexible pack that will not conform to your head.

  • Download a print-friendly version of our User Guide. 
  • You don’t have to remove the cooling packs from the vest to charge them. Put the whole product with packs included into the fridge for 45 to 60 minutes (or ice water for 20 minutes) until they are fully solid again.
  • If you take the packs out of the sleeves, slide the frozen cooling packs into each of the pockets.
  • Your HeadBand are now charged and ready to be worn.
  • These packs will have a frozen layer and a liquid layer. The liquid layer should be placed TOWARD your skin. This allows the packs to conform comfortably to your head.

TIPS: 

  • Cooling packs can be stacked but will take longer to freeze. 
  • Make sure the cooling packs lie flat or they will freeze into strange shapes.

If cooling packs freeze in strange shapes run warm water over them until they are squishy. Reshape. Lie flat. Refreeze.

How to Wear

  • Wrap band around your forehead.  
  • Use Velcro to secure the fit.
  • Your HeadBand should fit your body like a glove with no space between your skin and the cooling packs. 
  • If the HeadBand does not feel tight enough for you, take it off your head and move velcro 1/2 inch tighter.  Now put it on, it should stretch to fit your head tighter.

Cooling & Recharging

  • Your ThermApparel Headband will cool as long as the packs haven't phased to complete liquid - this may occur in 30 to 45 min depending on your level of activity and the ambient temperature.
  • To recharge the packs, put them back in the fridge for 45 to 60 minutes (or ice water for 20) until they are fully solid again.
  • Cooling packs can be stacked but will take longer to freeze. 
  • Make sure the cooling packs lie flat or they will freeze into strange shapes.
  • If cooling packs freeze in strange shapes run warm water over them until they are squishy. Reshape. Lay flat. Refreeze.

Washing & Care of Garment 

Machine Wash

  • Remove all cooling packs from the vest.
    (They will be destroyed if you keep them in there! Trust us, we tried it
    and it's not pretty.)
  • Secure the velcro so it won't snag and place it in a small net laundry bag.
  • Wash UnderCool in cold water with like colors.
  • Lay flat to air dry and store flat. (If it goes into the dryer don't panic, you haven't destroyed your vest garment. The dryer just shortens the
    life of the spandex.)

Hand Wash

  • Cooling Packs can stay in the vest garment. 
  • Hand wash with mild soap.
  • Rinse well.
  • Lay flat on a towel to air dry.

Storage of Cooling Packs

  • Do not leave cooling packs in a hot car or hot environment.
  • To get the most out of your cooling packs, keep them frozen when not in use. This can be done by leaving them in the freezer, fridge, or
    anywhere colder than 70°F/21°C. (The cooling packs can hang out in the fridge or freezer for years. It's ok.) 
  • Cooling packs will last for 2-3 years depending on usage.
  • Cooling Packs left in their melted state for extended periods of time will reduce lifespan.
  • To wash your cooling packs, use warm soapy water in the sink.  DO NOT put cooling packs in your washer, dryer, or dishwasher. (They will be destroyed! Trust us, we tried it and it's not pretty.)
  • For discounts on replacement packs, check out our Recycling Program.

Cautions

  • Consult your healthcare professional before using this or any cooling product for a medical condition.
  • ThermApparel Cooling Packs are designed for the specific objective of cooling the body.
  • ThermApparel LLC will not be liable for injuries or damages resulting from misuse or misapplication of our products.
  • Use only as directed.
  • Keep the cooling packs away from children and pets.
  • Do not puncture, microwave, or eat the cooling packs.
  • The vest and cooling packs are not fire retardant. The melting point is above 375°F/190°C. No SARA Hazards.
  • The PCM substance is oil-based, bio-degradable, and non-toxic.
  • Use at your own risk.

Warranty

1-year warranty against any defects in materials and/or workmanship. We will repair or replace, at ThermApparel’s discretion, within that time. Check warranty by state and country.

Returns & Damages Policy

If for any reason you find a product unsatisfactory, you may return the product in its unused, original condition, within 60 days of purchase date as stated on your receipt for a full refund of the amount paid, minus shipping.

Please contact us if your product is received damaged or defective and we will make it right! If your product is received damaged in shipping, document damage with photos, keep all packing materials, and report the damage to customer service at 855-232-7233 or contact.us@thermapparel.com. We will replace your product right away. For the full policy please visit thermapparel.com

Questions? Comments?

855-232-7233
contact.us@thermapparel.com