Price: $335.99 USD

Find long term relief with 2 signature UnderCool vests and 2 sets of cooling packs!

Please Note:

  • All prices listed in USD
  • International orders: your country’s taxes and duties are NOT included in the price or shipping
  • Adult signature required

This Purchase Includes:

  • 2 UnderCool vests in your choice of color, white or black
  • 2 sets of cooling packs

UnderCool features:

  • Adjustable straps and a velcro front for the best fit and comfort
  • Wicking fabrics and built-in mesh panels to keep you dry and comfortable
  • Cooling pack pockets along back
  • Cooling relief for up to 1 - 2 hours*
  • 30-day money back guaranteed

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

Size Waist
XXS 19” - 23” 48 cm - 58 cm
Extra Small 23" - 27" 58 cm - 68 cm
Small 27" - 31" 68 cm - 79 cm
Medium 33" - 37" 83 cm - 94 cm
Large 39" - 45" 99 cm - 114 cm
Extra Large 46" - 52" 117 cm - 132 cm

Waist Measurement:

If you bend to the side, you will crease in the middle of your body; this is your natural waist. That's where you want to take your waist measurement.

Womens Sizing Guide:

Please note sizing is dependent on waist size not bust size.

Men's Sizing Guide:

Please note sizing is dependent on natural waist size not chest size.
ThermApparel recommends ordering a size smaller than your usual T-shirt size.
(If you wear a large T-shirt, a medium UnderCool will fit best.)

Other Resources:

Please review our Return and Exchange Policy here and our Warranty Policy here.


Consult your doctor or health care professional prior to using this or any cooling products for a medical condition. ThermApparel LLC will not be liable for injuries or damages resulting from the misuse or misapplication of our products.

*Cooling times may vary depending on your level of activity and ambient temperature. 

Questions about our vests or shipping? Reach out to the ThermApparel team toll-free at 855-232-7233, write to us through our website’s contact form or chat with us via live chat. We always respond because, otherwise, that wouldn't be cool.