$99.99 USD

This product is currently unavailable.

UnderCool is the first cooling garment made with discretion in mind. Stay cool and look it too.

No cooling packs included with this option, but if you need a second vest you found it.

This Purchase Includes:

  • 1 UnderCool vest in your choice of color, white or black
  • 0 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  20" - 24"

 51 cm - 61 cm

Extra Small  24" - 28"

 61 cm - 71 cm


 28" - 32"

 71 cm - 81 cm

 34" - 38"

 86 cm - 97 cm

 40" - 46"

102 cm - 116 cm
Extra Large

 48" - 52"

121 cm - 132 cm
XXL 54" + 137 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. 

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

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.