What to Wear in a Sauna – And What to Leave at the Door
The short answer on what to wear in a sauna: it depends on the sauna and who’s using it.
At home, alone, wear whatever you want, including nothing. At a public sauna in Finland, nudity is the standard and nobody bats an eye. At a gym or public sauna in North America, a swimsuit or towel wrap is perfectly normal. At an infrared sauna in a wellness studio, lightweight cotton if you prefer coverage, bare skin if you’re after the full therapeutic effect. Below is everything you need to make the right call for your situation.
It Depends on the Sauna Type
Not all saunas run the same temperature, and that matters for what you should wear.
Traditional Finnish sauna runs at 70-100 degrees Celsius (160-212 degrees Fahrenheit). That heat makes any clothing feel like a poor choice. Cotton or linen if you insist on wearing something. The traditional norm is nudity with a towel to sit on.
Infrared sauna operates at 50-65 degrees Celsius (120-150 degrees Fahrenheit), significantly cooler than a Finnish sauna, but the heat source is different. Infrared penetrates your body directly rather than heating the air. Here’s the part most articles skip: clothing blocks 15-30% of infrared light penetration. If you’re using an infrared sauna for therapeutic reasons, muscle recovery, circulation, relaxation, that blocked percentage is working against you. Bare skin gets the full benefit. If you’re in it for the heat and not the infrared therapy specifically, a loose cotton shirt will not hurt.
Steam room sits at 43-48 degrees Celsius (110-120 degrees Fahrenheit) but with near-100% humidity. Wet fabric clings and stays wet. Swimsuit or towel wrap is the practical choice. Anything that doesn’t dry quickly becomes uncomfortable fast.
Public vs. Private - Reading the Room
Where you are determines what the other people expect.
Home sauna. Your rules. Nudity, swimsuit, old gym shorts, nobody cares. One rule that does apply everywhere, even at home: put a towel on the bench before you sit down.
Finnish public saunas. Nudity is the default in same-sex spaces. This isn’t sexual, it’s practical and cultural. Saunas were historically used by everyone, all ages, as a regular washing space. That context matters: when you understand why nudity is normal there, it stops feeling strange. In mixed-gender public saunas, a towel or swimsuit is more common. The short version: you will not be judged for using a towel, and you also will not be out of place going nude in a same-sex Finnish sauna.
North American gym saunas. Swimsuit is the expectation. A towel on your lap or as a wrap is fine. Don’t wear street clothes. Don’t wear shoes. Don’t overthink it.
Spa and wellness centers. Check for signage or ask staff. Most have a stated policy and most provide towel wraps. If you are unsure, ask, nobody minds the question.
Best Fabrics - and Why It Matters
The fabric question isn’t complicated once you understand the mechanism. You’re sweating. The fabric needs to handle that sweat without trapping heat, clinging, or becoming a bacterial problem.
Cotton is the default safe choice. It absorbs sweat without trapping heat, breathes reasonably well, and holds up fine at high temperatures. If you’re new to saunas and not sure what to buy, cotton is the answer.
Linen is better in heat and humidity. It dries faster than cotton, feels lighter, and handles repeated sauna sessions without breaking down the way cotton does. Worth buying if you sauna regularly.
Bamboo wicks moisture well and feels softer than cotton. A solid option if you prefer something between cotton and linen.
Synthetics - polyester, spandex, nylon - trap heat and moisture, cling when wet, can release chemicals at high temperatures, and grow bacteria faster than natural fibers. Skip them.
Heavy toweling fabric sounds logical but absorbs too much heat and becomes uncomfortable fast. The goal is loose and light.
What Not to Wear (and Why)
Metal jewelry. It heats up fast and can burn your skin. Take it off before you go in.
Synthetic fabrics. Already covered above, but it bears repeating: they trap heat, cling when wet, and some release additives at high temperatures. Not worth it.
Underwire bras. The metal heats up against your skin. Most women find a soft, wire-free cotton bralette or a towel wrap more comfortable in any type of sauna.
Shoes or socks. They trap heat, trap moisture, and block the foot’s heat exchange with the bench. Go barefoot on the bench. Bring flip-flops for the walk to and from if hygiene is a concern.
Wearable tech. Most smartwatches and fitness trackers are rated to 55 degrees Celsius maximum. A traditional Finnish sauna runs at 70-100 degrees Celsius, well above that rating. Leave the watch in your locker. It is not just about the device either: some trackers log temperature data that gets flagged as an anomaly when it spikes past 50 degrees.
Sauna suits. Heavy, non-breathable garments marketed with the promise that you will sweat more and burn more calories. They do make you sweat more. That sweat is water weight, not fat. In a traditional sauna, a sauna suit is a safety concern, your body cannot regulate temperature properly. In an infrared sauna, it blocks the light penetration you are paying for. Leave these for combat sports weigh-ins.
The Sauna Hat - Useful or Gimmick?
There are two very different things being sold under the name “sauna hat,” and one of them is useful.
A traditional felt or wool sauna hat is functional protective gear. Your head and ears take the most radiant heat in a hot sauna, especially the upper bench, where temperatures are highest. A hat slows that heat buildup and lets you sit in longer without feeling like your brain is cooking. Finnish sauna-goers have used them for this purpose for generations. If you regularly use a traditional sauna and find the heat on your head overwhelming, a felt hat is a legitimate fix.
The other thing, the trendy “infrared sauna hat” sold by wellness brands, usually a lightweight cotton thing with a logo, is a different product entirely. It provides basic head coverage. That is it. If you want that, any cotton beanie works just as well for a fraction of the price. You do not need a branded infrared hat.
Don’t Forget the Bench Towel
This one is basic etiquette in Finnish sauna culture and almost nobody outside that tradition covers it: you sit on your own towel, not directly on the bench. Bring a small towel specifically for this, separate from your drying towel. It keeps the bench hygienic, it keeps you more comfortable, and it is what people expect in any public sauna. Do it regardless of what you are wearing.
What to Wear After Your Sauna
The cool-down phase matters. Your body is still regulating temperature. Loose natural-fiber clothing or a bathrobe works well. Tight or synthetic clothing interferes with that regulation.
If you are doing contrast therapy, cold plunge or cold shower after the sauna, you will be wet. A quick-dry towel or robe is practical. Something you can change into soon is ideal.
Quick Answers to Common Questions
Do you have to be naked in a Finnish sauna? No. But in same-sex Finnish public saunas, nudity is the cultural norm and nobody treats it as unusual. Using a towel is always fine.
Can you wear a regular swimsuit in the sauna? Yes, in most public saunas outside Finland a swimsuit is the expected norm.
Is it OK to wear gym clothes in the sauna? Athletic shorts or a sports bra are fine in most gyms and public saunas. Skip anything tight or synthetic.
Can you wear a sports bra in the sauna? Yes, but avoid underwire. A soft, wire-free bralette or sports top without metal is more comfortable in the heat.
Should you wear shoes in the sauna? No. Barefoot on the bench is standard. Flip-flops for the floor walk are fine if you want them.
What should women wear in a sauna? Whatever is comfortable and appropriate for the setting, swimsuit, towel wrap, cotton shorts and top, or nothing. The same principle applies to everyone: natural fibers, loose fit, nothing you mind sweating in.
Can you wear a smartwatch in the sauna? Generally no. Most are rated to 55 degrees Celsius maximum. Traditional saunas run hotter. Leave it out.
Do you need a sauna hat? In a traditional Finnish sauna, a felt hat is useful if you want to stay in longer and don’t tolerate heat on your head well. In an infrared sauna, a hat is optional and basic cotton works fine.
What do you sit on in a sauna? Your own towel, placed on the bench. That’s the hygiene norm everywhere.
What should I wear after the sauna? Loose natural fibers. A robe, comfortable clothes, or just a towel if you’re still cooling down. Have a change of clothes ready if you’re going straight back to your day.