Sauna Theory™
Cooling shorts · 100% cotton
- Protect fertility & testosterone
- Up to 30 min cooling per sauna session
- 100% cotton — no microplastics on your skin
- Includes 2× freezable cooling inserts
A local cooling zone — while the rest of your body lets the sauna do its thing.
In an 176°F sauna your internal body temperature rises to 104°F. Studies show 2+ sauna sessions per week significantly reduce male fertility — recovery can take 3 to 6 months.
Sauna Theory creates a local cooling zone that keeps the testicles around 95°F, while your body gets the full sauna benefits.
1,169 men went before you.
Finally saunaing without guilt
"My wife and I have been trying for a few months. Every sauna felt like working against it. With this shorts it just feels right. Comfortable, and the pack stays genuinely cold."
20 minutes without wanting out
"I used to tap out around minute 14 because of that smothering feeling. Now I easily do 22. No painful cold — just comfortable."
Smart design
"The insert stays put. No shifting around, no surprises. The cotton feels premium."
Works as advertised
"Works fine. Pack thaws after half an hour but keeps insulating afterwards. Size chart was accurate for me."
Frequently asked questions.
How harmful is sauna for my fertility?
Male fertility declines from 99°F. In an 176°F sauna your core temperature can reach 104°F. Studies show 2+ sauna sessions per week significantly reduce male fertility — recovery can take 3–6 months.
How long does the cool pack stay cold?
Designed for the length of an average session (~30 min). After that the pack continues to thermally insulate against the external heat.
How many cool packs do I get?
Every shorts comes with 2 freezable cool packs, so you always have a spare ready.
Can I take it into a cold plunge?
Yes — actually recommended. The cold plunge re-chills the pack, perfect for contrast sessions.
How do I wash the shorts?
Remove the cool pack. Machine wash cold. Hang dry or tumble dry on low.
30-day money back.
Try Sauna Theory in your own sauna. Doesn't feel better? Send them back — no questions.