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4.8 — 1,200+ sauna sessions protected
Aluma SaunaShield
Keep your sauna habit — without putting your fertility at risk. A freezable cool pack held in a specialized pouch keeps the testicles at a safe ~95°F (35°C), while the rest of your body gets the full benefit of the heat.
~30 minutes of active cooling — a full sauna session
100% premium cotton — microplastic-free, no spandex
Never skip protection waiting on a frozen pack — two included, so one's always ready.
Covered for the entire session, not just the cold minutes — keeps shielding even after it thaws; a cold plunge re-cools it for round two.
1x Aluma
$59.95 $120.00
Most popular!
2x Aluma
$119.90 $240.00
3x Aluma
$179.85 $360.00
1x Aluma SaunaShield
2x Aluma SaunaShield
3x Aluma SaunaShield
1x Aluma SaunaShield
2x Aluma SaunaShield
3x Aluma SaunaShield
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1x Aluma SaunaShield
2x Aluma SaunaShield
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*We recommend 3-6 months of consistent use for best results
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Why it exists
Your sauna habit is quietly working against your fertility.
Sperm production needs the testicles to run cooler than the rest of your body — it's why they sit outside it. A 175–200°F sauna pushes them far past the safe threshold, session after session.
Why Bryan Johnson Uses Cooling as Part of His Routine
Bryan Johnson, the entrepreneur behind the Blueprint longevity project, has publicly discussed using scrotal cooling as part of his health optimization routine. Rather than relying on opinions, he approaches every intervention as an experiment — tracking biomarkers and measuring the results before deciding whether it's worth keeping.
His philosophy is simple: test, measure, and optimize.
While scrotal cooling isn't a magic solution, maintaining a lower testicular temperature has been studied because heat can negatively affect sperm production. That's why Bryan has included cooling among the many evidence-based practices he evaluates in his longevity protocol.
You don't need a full longevity protocol to apply the same principle — just a colder sauna session.
**Bryan Johnson is not affiliated with or endorsing Aluma.
Why Bryan Johnson Uses Cooling as Part of His Routine
Bryan Johnson, the entrepreneur behind the Blueprint longevity project, has publicly discussed using scrotal cooling as part of his health optimization routine. Rather than relying on opinions, he approaches every intervention as an experiment — tracking biomarkers and measuring the results before deciding whether it's worth keeping.
His philosophy is simple: test, measure, and optimize.
While scrotal cooling isn't a magic solution, maintaining a lower testicular temperature has been studied because heat can negatively affect sperm production. That's why Bryan has included cooling among the many evidence-based practices he evaluates in his longevity protocol.
You don't need a full longevity protocol to apply the same principle — just a colder sauna session.
**Bryan Johnson is not affiliated with or endorsing Aluma.
Not trying for kids? This still matters.
Fertility is a live signal of your health — not just a baby switch
Sperm quality is one of the most sensitive markers of male health — it responds to stress on the body faster than almost anything else you can measure.
And heat is one of the clearest stressors. The testicles are built to run cooler than the rest of you; repeated sauna heat pushes them past that safe range, session after session. The damage doesn't announce itself — it compounds quietly, in the years you assume everything's fine.
Protecting your fertility isn't about planning a family. It's about not letting a habit you do for your health quietly work against it — so that whenever the decision comes, the choice is still yours to make.
You don't have to want kids today, but tomorrow should still be your decision to make.
Not trying for kids? This still matters.
Fertility is a live signal of your health — not just a baby switch
Sperm quality is one of the most sensitive markers of male health — it responds to stress on the body faster than almost anything else you can measure.
And heat is one of the clearest stressors. The testicles are built to run cooler than the rest of you; repeated sauna heat pushes them past that safe range, session after session. The damage doesn't announce itself — it compounds quietly, in the years you assume everything's fine.
Protecting your fertility isn't about planning a family. It's about not letting a habit you do for your health quietly work against it — so that whenever the decision comes, the choice is still yours to make.
You don't have to want kids today, but tomorrow should still be your decision to make.
How Aluma works
Heat everywhere it helps. Nowhere it hurts.
Material
In a 200°F room with open pores, what's on your skin matters.
100% premium cotton
Most underwear is a cotton/spandex blend — synthetic elastane woven through the whole garment. Aluma is pure cotton, all the way through.
Microplastic-free
Sauna heat opens your pores into full absorption mode. The one place you don't want plastic fiber is the one place Aluma covers.
Easy care
Remove the gel pack, machine wash cold, refreeze the pack. Ready for your next session.
Material
In a 200°F room with open pores, what's on your skin matters.
100% premium cotton
Most underwear is a cotton/spandex blend — synthetic elastane woven through the whole garment. Aluma is pure cotton, all the way through.
Microplastic-free
Sauna heat opens your pores into full absorption mode. The one place you don't want plastic fiber is the one place Aluma covers.
Easy care
Remove the gel pack, machine wash cold, refreeze the pack. Ready for your next session.
From the sauna
Sauna regulars, protected.
30 Days Money-Back Guarantee
30 Days Money-Back Guarantee
Feel Your Best During Every Sauna Session.
Get your Aluma Sauna Underwear today — up to 50% off with free shipping.
Frequently Asked Questions
Everything else you're wondering.
How long does the cooling last?
Active cooling lasts roughly 30 minutes — the length of a typical sauna session. Once thawed, the gel pack continues to act as thermal insulation between you and the heat. If you cold plunge between rounds, the plunge re-cools the pack.
Is it comfortable to wear in the sauna?
Yes — the briefs are 100% premium cotton, cut for the heat, and the pouch holds the pack snugly so nothing shifts when you move or lie down.
How do I prepare it before a session?
Put a cool pack in the freezer 1–2 hours before your session, then slot it into the pouch before you go in. Every pair ships with two packs so you can rotate.
How do I wash it?
Remove the gel pack, then machine wash cold. The pack itself just gets rinsed and goes back in the freezer.
Which pack should I get?
f you sauna once a week, the 1× Pack works. At 2+ sessions a week — exactly the frequency where the fertility impact shows up — the 2× or 3× Pack keeps a clean pair and a frozen pack ready at all times.
Start Sweating the Way Nature Intended
Keep every benefit of your sauna habit — without the hidden cost to your fertility. The easiest addition to your sauna routine. Not satisfied? Get a full refund within 30 days — no questions asked.
Natural fertility protection
Full sauna heat benefits
100% cotton, microplastic-free
Begin protecting your fertility for just $1.15 per session. Your safest sauna yet is just one cool pack away.
