Compression LinerSupportive, breathable fit
Cooling PouchOutside the liner for comfort and control
Lower, Contoured FitPositions the cold pack where it's most effective
The technology
A targeted cooling pouch.
A discreet, external pocket holds a removable cold pack, positioned slightly lower for optimal comfort, support, and cooling.
How it works
Simple.
Effective.
-
1
Cool the insert.
Chill in your freezer (or use a reusable pack).
-
2
Slip it in.
Place the cold pack in the external pouch.
-
3
Sauna comfortably.
Enjoy the heat while staying cool where it counts.
Sauna Ready
Stay comfortable through high heat.
Targeted Cooling
Helps maintain a cooler, more comfortable core.
Swim Approved
Quick-drying, chlorine & saltwater friendly.
Premium Build
Supportive liner, durable fabric, and a modern fit.
FAQ
Questions.
What do I get, and when?
The kit is the trunks, two shaped cold packs and a slim neoprene sleeve for the spare. $89. The first batch ships January 2027, and the waitlist gets first-batch pricing.
Does it work?
A frozen pack in an insulated pouch keeps the area it covers cooler than the sauna would. In our first test a pack stayed cold through a full 20 minute session. We will measure skin temperature on the prototype and post the numbers, good or bad. We claim nothing more.
How long does a pack last?
A full 20 minute session in our first test. Hotter saunas shorten that, so expect 15 to 20 minutes and swap in the spare for a second round.
Is it safe?
The pack never touches skin. The liner sits between. Never put a frozen pack on bare skin, and take it out if it ever feels painfully cold. One pack per 20 minutes.
Can I wear them in the pool?
Yes, they are swim trunks. Take the pack out first.
Will this protect my fertility?
We make no fertility or hormone claims. Heat raises temperature down there and a cold pack lowers it where it sits. Whether that changes anything downstream has not been shown. If you are trying to conceive, talk to your doctor and consider skipping the sauna.