Don't let the heat get in the way of the things you love most.
It's time to take back your life, stay cool and be cool!



No one wants a bulky cooling vest weighing them down. That's why UnderCool cooling vest weighs less than 2lbs— including the cooling packs!



Made from breathable mesh and wicking fabrics, the UnderCool cooling vest is designed to keep you cool and dry. Our flexibility is unmatched!



Our slim design conforms to your shape, you can even wear the UnderCool cooling vest under your clothes. You can stay cool and no one else has to know!

"ThermApparel has flipped the script on cooling vests.
UnderCool is a game changer."


"It’s been a total lifesaver."

“If you are going to own just ONE thing to make your life with some ridiculous chronic illness, it must be THIS cooling vest! First of all, I can appreciate that it is not one of those bulky cooling vests that make you look like you are preparing to board a life raft.
Secondly, this baby keeps me cool for up to 6 hours in the sweltering heat of Florida. It’s been a total lifesaver. It’s super comfortable, and I’m way grateful that I can wear something that is unnoticeable under my clothes and also keeps me from having a heat-related flare-up!”