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Sizing Guide

Need Help With Sizing? Fill Out the Form, Get a Free FitKit.

The ThermApparel Fit Kit is loaded with tips and suggestions and a handy measuring tape so you will get the correct size when you order. Fill out the form below and we will send you a FitKit!

UnderCool 3 Sizing Guide

3.0 Sizing Tip: If you are in between 2 sizes order the LARGER size. 

Please review our sizing chart below to ensure the best fit for your UnderCool

Size Natural Waist (in) Natural Waist (cm)
 XXS 18" - 24" 46cm - 61cm
S 24" - 31" 61cm - 78cm
M 31" - 40" 78cm - 101cm
L 40" - 51" 101cm - 129cm
XXL 51" - 64" 129cm - 162cm

Sizing Tips:

  • Sizing is based on your natural waist, not your hips, pants, chest, or cup size
  • Measure against your skin
  • Take your measurements in front of a mirror to make sure it is level
  • UnderCool should fit your body like a glove to give your the best cooling
  

UltraCool Sizing Guide

Please review our sizing chart below to ensure the best fit for your UltraCool

Size Natural Waist (in) Natural Waist (cm)
M/L (comes with 8 cooling packs) 32" - 45" 78cm - 101cm
XL/XXL (comes with 10 cooling packs) 45" - 64" 101cm - 129cm

 Sizing Tips:

  • Sizing is based on your natural waist, not your hips, pants, chest, or cup size
  • Measure against your skin
  • Take your measurements in front of a mirror to make sure it is level
  • UnderCool should fit your body like a glove to give your the best cooling

    RallyWrap Sizing Guide

    The RallyWrap is one size fits most. If you would wear an XL Tee Shirt size, we recommend getting your RallyWrap with 8 Cooling Packs so that the cooling will wrap around your entire torso.

    Using A Fabric Measuring Tape

    • Stand or sit up straight and tall.

    • Bend at both sides. Where you naturallybend in your natural waist.

    • Measure where you bend. If you don't bend measure below rib cage but above belly button.

    Don’t Have a Fabric Measuring Tape?

    You can measure your waist the same way with a straight ruler and:

    • String / Yarn
    • Dental Floss
    • Shoelace
    • Charging cord from your phone