$49.99 USD

This product is currently unavailable.

Garment Specifics:

Condition - Fair

Wear and tear. Small nicks in spandex in back panel. Wear on all binding. 

Metal hardware on straps.



SCRATCH & DENT SALE (All sales are final. No refunds or exchanges.)

Find long term relief with 1 signature UnderCool vest!

This Purchase Includes:

  • 1 UnderCool vest 

UnderCool vest 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

  • 60-day money back guaranteed

Use the dropdown in Checkout to add a set of cooling packs to your purchase.

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




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


54" +

137 cm +


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.)

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.


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

  • All sales are Final

  • International orders: your country’s taxes and duties are NOT included in the price or shipping

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.