What Are We Wearing in the Sauna? Why Natural Materials Matter More Than You Think
Since joining a lifestyle centre to embrace more of the fitness activities I enjoy, one of the highlights for me has been the outdoor swimming pool, along with the variety of beautifully scented saunas and steam rooms. I’ve always been mindful about the clothes I buy—considering not only the materials used but also the ethics and sustainability practices behind the brands. This awareness becomes even more important when it comes to specialized sportswear, which often relies on synthetic blends to meet performance needs.
Swimwear, for example, is typically made from a mix of materials designed to handle constant water exposure and provide a tight, streamlined fit for training. After a swim session, I often rotate between the sauna and a cold dip to help restore and recover my muscles and joints. Over time, I started noticing the variety of gear people wear in the sauna—whether they’re just popping in after a workout, taking a break during the day, or moving between steam rooms and saunas. This got me thinking more deeply about what we wear in these high-heat environments, and how it might be affecting our health.
Why Natural Materials Matter in Saunas: Avoiding Toxic Exposure from Synthetic Clothing
Many of us wear swimwear or gym clothing into saunas without a second thought. But most of these garments—especially those designed for performance—are made from synthetic materials like polyester, nylon, or spandex. In the dry, intense heat of a sauna, these synthetic fabrics can begin to break down and release harmful chemicals into the air.
What Happens to Synthetic Fabrics in High Heat?
Synthetic materials are derived from petrochemicals, and when exposed to high temperatures (saunas typically range from 70°C to over 100°C / 158°F to 212°F), they can release volatile organic compounds (VOCs), plasticizers, flame retardants, and even microplastics. These can be inhaled or absorbed through the skin.
Chemicals released may include:
- Phthalates – hormone disruptors commonly used to soften plastics
- Formaldehyde – a skin and respiratory irritant, and a known carcinogen
- Antimicrobial agents – often used in performance gear, but not always safe when heated
All of this works against the very goal of a sauna: to detoxify and rejuvenate.
Why Choose Natural Fibers Instead?
Natural materials such as cotton, linen, hemp, and untreated wool are far safer and healthier choices in sauna settings. Here’s why:
- Non-toxic: These fabrics do not emit harmful chemicals when exposed to heat.
- Breathable: Natural fibers allow your skin to breathe and sweat, enhancing detoxification.
- Durable in heat: They maintain structural integrity and don’t degrade like synthetics.
- More hygienic: They resist odor and bacteria buildup when properly maintained.
What to Wear (or Not Wear) in the Sauna
If you’re wondering how to make the switch, here are some practical suggestions:
- Go nude where appropriate: Many traditional saunas recommend this, especially in Scandinavian cultures. It’s often the cleanest and healthiest option.
- Wrap in a cotton towel or robe: A large organic cotton towel or robe provides coverage and comfort without introducing toxins.
- Avoid treated fabrics: Some natural-looking garments are chemically treated. Look for certified organic or untreated options.
WellFabrics.com give you a few tips as to where to shop.
http://Top 5 Bamboo Swimwear Brands for Sustainable Fashionistas
Wearing synthetic athletic wear or swimwear in a sauna can quietly expose us to a host of unnecessary toxins. Being more intentional about what we wear—choosing breathable, untreated natural fibers—allows the body to truly benefit from the healing effects of sauna therapy. It’s a small shift with a big impact.
Next time you head into the steam or sauna, pause to think: is what I’m wearing helping my body detox, or working against it?
MOVESGOOD was my go-to for sauna wear. Made from 90% bamboo, it is very soft and comfortable with the small 10% elastane – shapes well to the body but is not skin tight to allow the body to breathe and pores to open as you sweat.
