YOUR SAUNA IS KILLING YOUR TEST
Bryan Johnson, the world's premier biohacker, recently found a shocking result: heat from sauna damages your testicles, lowers your testosterone, and hurt your fertility.
Save Your TestFounding batch opening soon. Limited first production run.
YOUR SAUNA IS KILLING YOUR TEST
Bryan Johnson, the world's premier biohacker, recently found a shocking result: heat from sauna damages your testicles, lowers your testosterone, and hurt your fertility.
Founding batch opening soon. Limited first production run.
Cooling Insert Pouch
Secure front pouch designed for a removable cooling insert.
Sauna-Specific Fit
Built to stay close to the body during high-heat sessions.
Cotton-Forward Comfort
Soft, breathable feel designed for sauna routines.
Sauna Sack™ Performance Boxer Brief
A black boxer brief with a secure front zipper pouch designed to hold a removable cooling insert during sauna and high-heat sessions.
Sauna Sack™ Performance Boxer Brief
- Secure zippered front pouch
- Designed for sauna and heat routines
- Cooling insert stays concealed when zipped
- Soft cotton-forward feel
- Minimal black waistband branding
- Remove insert before washing
Popular ✦
Four steps. Built into your routine.
Freeze Insert
Place the removable cooling insert in the freezer before your session.
Zip Into Pouch
Slide the insert into the front pouch and zip closed.
Sauna As Usual
Wear during your heat session.
Remove & Wash
Take the insert out before washing the underwear.
A simple performance garment for a real problem.
Research suggests repeated sauna exposure can temporarily affect sperm parameters in some men. Sauna Sack is designed as a simple performance garment for men who want to manage heat exposure during sauna and high-heat routines.
It is not a medical device and does not diagnose, treat, cure, or prevent infertility.
Inspired by the growing longevity conversation around sauna heat and male reproductive health.
Your sauna has a
heat problem.
The sauna is part of your routine. Sauna Sack helps you manage targeted heat exposure with a secure cooling pouch built into premium performance underwear.
Questions, answered.
Founding batch opening soon
Limited first production run.
Designed for sauna users
Built around real heat routines.
Built with real feedback
Shaped by men who actually sauna.
Clear preorder policy
Transparent timelines and refunds.
Join the first drop.
Get early access to the founding batch, launch updates, and first-drop pricing.