You've never cooled like this before...

Photo of cooling packs made from phase change material.

Our Phase change material is...


Our specialized slim design is made to conform to your body and provide maximum cooling relief without all the extra weight and bulk!

Long Lasting

Our packs provide cooling relief for up to four hours! With our industrial grade packaging you can refreeze and reuse them for up to 20 years!


Our PCM is non-toxic, biodegradable, and FDA approved for use in cooling garments! No grease, no stains, and no worries!


Easy as 1, 2, 3...

Photo of cooling packs.

Photo of cooling packs.


Before going out, store your cooling packs in a cold place for about one hour.

Photo of cooling packs being inserted into UnderCool cooling vest.


Slide your frozen cooling packs into the hidden pockets on the back of your UnderCool.

Photo of woman doing yoga while wearing UnderCool cooling vest.

Photo of woman doing yoga while wearing UnderCool cooling vest.


Put on your UnderCool and experience cooling relief like never before!


Want more Cooling Packs For Your UnderCool?

Photo of man wearing UnderCool cooling vest while cooking on the grill.

Hey we get it! Sometimes 2 hours just isn't enough to cover that company barbecue, that football game, or your family's long-anticipated trip to Disneyland.

But don't fret, we got you!

Sometimes it's nice to have some extra cooling packs on hand to switch out on those long hot days. We made extra sets of our special cooling packs available on our shop!

If you need more packs you can always buy more, remember to always stay cool!

Ships to the United States for under $19.99 and ships to the rest of the world for a flat rate of $45.99.