TestGuard Sauna Cooling Shorts
TestGuard Sauna Cooling Shorts
TestGuard Sauna Cooling Shorts
TestGuard Sauna Cooling Shorts

2,500+ 

TestGuard Sauna Cooling Shorts

£49.00
£70.00 
30% off

Designed to protect your fertility from heat damage, extend sauna sessions and performance. Made with 100% cotton for zero synthetics against open pores. 

Size

MATERIALS

Body made from 100% Premium Cotton

Cotton/elastane waistband

 

Each pair comes with 2x Freezable Cooling Packs (BPA Free & Non-Toxic)

SHIPPING 

FREE UK DELIVERY FOR ORDERS OVER £70.

 

Ships in 1-2 business days.

You built the sauna habit for a reason. TestGuard is built so you don't have to choose between keeping it and protecting what matters.

Most cooling products weren't designed for a sauna. They were designed for post-vasectomy recovery or everyday fertility support and they fail in real sauna heat. TestGuard was engineered specifically for the 80–100°C environment, for the full duration of a real session, in shorts that you can wear at any commercial gym.

30 DAY MONEY BACK GUARANTEE

FREE UK SHIPPING

DESIGNED IN THE UK

Ultra-breathable.

All natural.

At 80–100°C, your pores are fully dilated. Whatever fabric is sitting against your skin in that environment is being absorbed.

 

Polyester swimwear in a sauna means microplastics, phthalates, and synthetic dyes making direct contact with the most hormonally sensitive area of your body, every session. 

 

TestGuard is 100% cotton throughout:

  • Zero synthetic contact with open pores at peak heat
  • Stays light — won't soak heavy with sweat
  • Natural moisture wicking without trapping heat 
  • Relaxed fit — breathable and non-compressive
  • No microplastics shed against the skin

Engineered for

the full session.

Our BPA-free ergonomic gel insert sits in a dedicated internal pouch and positioned in direct contact with the scrotal area.

 

Phase 1: Active cooling for 30 minutes.

Phase 2: Passive insulation for as long as you stay in.

 

Two inserts ship with every pair. Swap mid-session for coverage up to 60 minutes.

 

Looks like normal shorts from the outside, with full fertility protection on the inside.

WHAT HAPPENS TO FERTILITY WITHOUT SAUNA PROTECTION

The world's most-measured man learned this the hard way.

↓54% 

motile sperm count

sperm that can actually reach the egg

↓55% 

normal sperm morphology

More than half were the wrong shape

↓55% 

normal sperm morphology

More than half were the wrong shape

>50% 

suppression of concentration

fewer overall sperm numbers

"238 sessions to learn that the most important variable in my sauna protocol was a bag of ice on my groin."

 

— Bryan Johnson

TestGuard vs. Normal Sauna Shorts

TestGuard Sauna Shorts

Normal swimwear

Active Cooling Function

All Natural Fibres

No Microplastic Contact

Sperm Protection

Suitable for Sauna Heat

KEEP THE PROTOCOL

KEEP THE PROTOCOL

KEEP THE PROTOCOL

LIFE TIME WARRANTY

PROTECT YOUR BIOLOGY

PROTECT YOUR BIOLOGY

PROTECT YOUR BIOLOGY

PROTECT YOUR BIOLOGY

What other men are saying about our shorts

FAQs

How does sauna affect my fertility and testosterone?

Inside a sauna at 80–100°C, your body's natural scrotal cooling system is completely overwhelmed. Your testicles sit outside the body for one reason: sperm production and testosterone output both require a temperature lower than your core. The cremaster muscle and surrounding blood vessels work constantly to regulate that temperature — but in a sauna, there is no cooler environment to draw heat away from. Repeated unprotected sauna sessions suppress testosterone output — affecting energy, drive, recovery, and muscle independently of any fertility concerns.

How long does the cooling actually last?

The gel insert provides active cooling for the first 30 minutes of your session. Two inserts ship with every pair — swap mid-session and you're covered up to 60 minutes. For sauna-cold plunge-sauna cycles, run both inserts back to back without a gap in protection. And once the insert has done its job, the cotton-lined insulating layer continues to slow re-heating — so you're never going from protected to completely exposed.

Will these look strange at a public gym or spa?

No. TestGuard are cut as standard athletic shorts. There's no visible pouch, no external insert, nothing that looks out of place in a gym sauna or public spa changing room. The insert sits internally. From the outside they look like the shorts the man next to you is wearing. That was the design requirement everything else was built around.

I'm not trying for a baby — does this still apply to me?

Yes. The same heat stress that suppresses sperm production also damages the Leydig cells responsible for producing testosterone — affecting your drive, recovery, and energy independently of any fertility plans.

Sperm production takes 74 days, meaning damage from today's session shows up in your parameters two and a half months from now. Whether or not kids are on the agenda, your hormonal health is taking the hit.

What's the return process?

30 days, full refund, no questions asked. If the insert doesn't last your session, if the fit isn't right, if it isn't everything described, return it.