Sauna is great for you. Brutal on your sperm.
KOLDWR Pro keeps you cool exactly where heat does damage. A frozen pack in a sewn-in front pouch, for the full session. Hands-free.
Get the Kit
Sold out · next run landing soon
How It Works
Why longevity optimizers cool down in the sauna
Cooling the groin during heat exposure spread through sauna and longevity communities as a DIY workaround. KOLDWR is a cooling boxer brief built for it.
Why not just rig an ice pack?
Every workaround here is a real thing people do in saunas. Here is how they honestly compare.
Frequently Asked Questions
Top questions
Yes. The gel pack cools gradually, not shock. The sewn in front pocket holds it securely with a fabric barrier, so you never feel raw cold directly on skin. Most users forget it is there after the first minute.
We have not run a laboratory test of pack duration at sauna temperature, so we do not publish a number. The pack cools hard while it is frozen, and once it thaws it keeps insulating, so the area stays cooler than bare skin for the rest of the session. Two packs ship in the kit, so you can swap a fresh one in for another round.
Yes. Peer-reviewed research shows that elevated scrotal temperature significantly impacts sperm quality. KOLDWR is designed to reduce that heat exposure right where it matters.
Every order is covered by our 30-day money-back guarantee. Return unworn pairs free within 30 days of delivery for a full refund.