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Confidence, comfort and freedom through cooling. Introducing UnderCool, the revolutionary cooling vest that’s lightweight, invisible and meticulously designed for extreme comfort and freedom of movement.


Cooling. Perfected.

How to beat the heat

  • Cool it.

    • • Quickly charge the cooling packs in the fridge, freezer or ice water.
    • • Cooling packs provide about 2 hours of oh-so-sweet cooling.
  • Wear it.

    • • Slip the cooling packs into the vest and wear under your outer layer of clothing.
    • • Before ordering, check out our sizing guide to find your best.
  • Love it.

    • • Take UnderCool for a spin in with our  60 day return policy.
    • • Rechargeable cooling packs mean you can look forward to using it again and again.

not all cooling vests are created equal.

But we’ve got you covered.
Breathable wicking fabric, fully adjustable straps and cooling packs that conform to your body for maximum cooling. Plus, it all weighs under two pounds.
Cool, right?

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Designed to boost your body.

Our unique cooling packs freeze at the perfect temperature to keep you body running at its optimal temperature.

“not too cold, not too hot, just right”

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No Compromises Needed

Like a perennial, our vests are long-lasting and ready to provide cooling relief for seasons to come. Never settle for less! With UnderCool, it’s all good.







Our Tech

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.