5RWHY No Poly in Sauna

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5 Reasons To Never Wear Polyester in the Sauna (And What You Should Wear Instead)

See why thousands of men have ditched plastic in the sauna!

Fabric

Toxic Chemicals

Problematic in sauna

Microplastic Exposure

100% organic cotton +

100% Merino wool

None - 3rd party tested + OEKO-TEX Certified

Breathable & sweat wicking, no harmful chemical leaching

Protects from Microplastics

"The Other Guys"

100% Plastic (polyester, nylon, spandex)

Often contains high levels of BPA, Phlates and PFAs

Sauna heat may leach harmful plastic chemicals into open pores

Loaded with Microplastics

Do you REALLY want to wear plastic in the sauna?

1. polyester is literally just plastic

A man sits on a wooden bench with his shorts and upper legs wrapped in plastic film.

Those "performance shorts"? Just plastic in disguise. Often the same type of plastic that water bottles are made of. Do you really want to wear plastic in the sauna?

2. Polyester may Contain high levels of hormone disrupting chemicals

A shocking study found that 100+ activewear brands contained high levels of BPA - some even have 40x the legal limit!

3. Heat + Sweat Increase Chemical Exposure

A close-up of sweaty skin with a graphic overlay showing molecules being wicked away by a blue shirt.

When you get hot & sweaty in the sauna, your pores open up.

At the same time, sauna heat can cause those hormone disrupting chemicals to off gas from your polyester shorts - making it easy to leach into your skin.

4. These Toxic Chemicals May Affect Your Testosterone

Headlines about chemicals in plastic lowering testosterone, shown over a photo of a person's muscular back in a gym.

Studies show these toxic chemicals (like BPA) are hormone disruptors - they can mess with your testosterone levels - even in small doses.

5. You know you shouldn't microwave plastic - so why microwave yourself in plastic?

Microscope, scale with beaker, shorts, certificate on a table with testing badge.

You probably don't microwave plastic. But that's literally what you're doing to your body when you rock traditional gym shorts in the sauna.

So what should you wear instead?

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5,000+ ⭐⭐⭐⭐⭐ REVIEWS

The Safest Shorts for the Sauna

100% NATURAL FIBERS - We only use 100% organic cotton and 100% Merino wool - never polyester or plastic-based fabrics.

CERTIFIED NON-TOXIC - Our manufacturing partners are GOTS & OEKO-TEX Standard 100 class 1 certified. We also third party test all of our garments - ZERO BPA, PFAS or Phthalates.

NATURALLY BREATHABLE & MOISTURE WICKING - Our organic cotton is super breathable - and our Merino wool wicks sweat to keep you clean & comfortable.

ATHLETIC FIT & FUNCTION - The exact same fit as the "big brands" - without the toxic plastic fabrics.

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