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 cooling vest and cooling packs are safe to wear directly on your skin!

Our cooling packs re-freeze in any environment under 70 degrees Fahrenheit (21 Celsius). A freezer or refrigerator should re-freeze the packs in 30 minutes! We designed our cooling packs for our UnderCool cooling vests but you can use them to cool anything. Stay cool!

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 for up to 2 hours*! With our industrial grade packaging you can refreeze and reuse them for up to 20 years!



Our packs are non-toxic, biodegradable, and FDA approved for use in cooling garments! 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, 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!


*Cooling times may vary depending on conditions and activities.