Price: $99.99 USD

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 Men 20" - 24"
Women 18" -  22”

Men 51 cm - 61 cm
Women 45 cm - 55 cm

Extra Small Men 24" - 28"
Women 22" - 26"

Men 61 cm - 71 cm
Women 55 cm - 65 cm


Men 28" - 32"
Women 26" - 30"

Men 71 cm - 81 cm
Women 65 cm - 75 cm

Men 34" - 38"
Women 32" - 36"

Men 86 cm - 97 cm
Women 80 cm - 91 cm

Men 40" - 46"
Women 37" - 44"

Men 102 cm - 116 cm
Women 96 cm - 111 cm
Extra Large

Men 48" - 52"
Women 45" - 51"

Men 121 cm - 132 cm
Women 114 - cm - 129 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.