You've never cooled like this before...
Our cooling packs are best in class.


Not all cooling packs are created equal.

A cooling vest is nothing without cooling packs! That's why it is just as important to pick the right cooling packs with the right cooling vest.

Our cooling packs are made from phase change material— a specialized material that is chemically engineered to freeze at 70 degrees Fahrenheit (21 Celsius). Our packs are designed to keep you cool and comfortable without causing ice burns like other cooling packs do. That's why our vest and cooling packs are safe to wear directly against your skin.

Our cooling packs re-freeze in any environment under 70 degrees Fahrenheit (21 Celsius).

  • 20 min in ice water

  • 40 min in the freezer

  • 60 min in the fridge

PCM temperature range

Our cooling packs are...



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


Long Lasting

Our packs provide cooling relief up to 2 hours*! With our industrial grade packaging you can refreeze and reuse them for many years to come.



Our packs are non-toxic and biodegradable. No grease, no stains, and no worries!


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, the kids 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 in our shop.

If you need more packs you can always buy more, remember to always stay cool, play cool, be cool.


*Cooling times may vary depending on conditions and activities.