If you’re looking for the best cooling apparel, you’ve come to the right place. From the materials and construction, to the ergonomic design, our team thought of everything when creating the UnderCool cooling system.

All of our products are backed by a 60 day money back guarantee.

UnderCool, it’s a game changer.

More than the best cooling vest, more than the best cooling packs.
  It’s the combination of the two that assures optimum performance.
What’s the point in owning a cooling vest if it’s bulky and uncomfortable?

ThermApparel’s Phase Change.
Built to be cool.

Our unique bio-degradable non-toxic Phase Change technology keeps you cool when others can’t.

They are easy to use too! Ready to be frozen right out of the box, no need to soak or "plump".  You can leave them in your fridge or freezer for an unlimited amount of time between uses without worry.

cooling packs freeze
at 70ºF (21ºc)

safe to wear directly
against your skin

works great in dry AND humid conditions

our packs fit into all ThermApparel cooling vests and are available in two options for your needs and comfort 

two cooling pack options:‌

ThermApparels environmental difference.

ThermApparel uses a bio-based PCM which is non-toxic and bio-degradable. A great improvement over older technologies like paraffin PCM and salt hydrate gels.

All plastics used to encapsulate PCM will eventually wear out. Unlike our competitors ThermApparel offers a recycling program to easily and safely replace worn out Cooling Packs.

All good things must come to an end. Lets make the end easy.

Questions? Check out our cooling pack recycling program and get up to $45 off a new set of Cooling Packs.

Learn More

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.