Last updated 2026-07-09

What do most people actually wear in a sauna?

It depends entirely on the setting, and anyone who gives you one answer is wrong. In Finnish tradition, where the sauna as we know it comes from, bathing naked is the norm. The Finnish Sauna Society describes the sauna as "a place for physical and mental relaxation," with traditional use going without clothing ^[1]. Walk into a gym sauna in the U.S., though, and you'll see board shorts, full swimsuits, and towels, all of them fine.

Here's the breakdown most people land on. In a private home sauna, or a session with close friends, a towel or nothing is the most comfortable and most hygienic choice. In a shared commercial or gym sauna, a swimsuit or lightweight cotton towel is the accepted standard. In some European spa facilities the reverse is true: nudity is required in the sauna room itself, and a swimsuit only comes out at the pool. Check the posted rules before you sit down.

The point isn't modesty or tradition. It's heat management. Your body sheds heat through sweat, and anything covering your skin slows that process. Less fabric between you and the air means your body regulates temperature more efficiently.

What are the best fabrics to wear in a sauna?

If you're wearing anything at all, fabric is the decision that matters. Cotton wins. It's breathable, it absorbs sweat without trapping heat against your skin, and it doesn't off-gas chemicals when it gets hot. A plain cotton towel, cotton swimsuit, or lightweight cotton shorts all work. Linen does the same job for the same reasons.

Wool is a real option, which surprises most people. Finnish and Scandinavian sauna-goers sometimes sit on wool felt pads, and a thin merino towel handles heat well. Merino's natural crimp holds airspace between fibers, so it doesn't seal against your skin the way a synthetic knit does.

The fabrics to avoid:

Many synthetic performance fabrics start losing structural integrity above roughly 150°F (65°C), which sits inside the normal range of a Finnish-style sauna ^[2]. That's not a promise your yoga pants will melt on the bench. It's a good reason to leave them in the locker room.

For home sauna users, cotton has a second advantage: it launders easily and often, which matters more than people expect. Sauna benches build up bacteria and sweat residue fast.

Is it okay to go naked in a sauna?

In a private sauna, yes. It's the traditional approach and often the most practical one. In a public or shared sauna the facility's rules decide, and most American gym and spa saunas don't permit nudity in coed spaces.

Physiology favors going without. Bare skin gives your body the most surface area for evaporative cooling and sweat release. The American College of Sports Medicine notes that evaporative cooling accounts for the majority of heat dissipation during exercise and passive heat exposure ^[3]. Any material over the skin cuts into that.

If you're building or buying a sauna for home, design the session around your own comfort. Plenty of people use a towel for sitting anyway, not for modesty, but because it puts a barrier between skin and hot wood, soaks up sweat, and keeps the bench cleaner. That same towel becomes your covering if someone else joins.

Should you wear a swimsuit in a sauna?

A swimsuit is acceptable and genuinely comfortable in most public settings. The catch is the fabric. Most modern swimsuits run 80 to 85% nylon or polyester with 15 to 20% elastane for stretch ^[4], and none of that holds up well to repeated high heat.

Sauna in a swimsuit regularly and, over a few months, the elastane breaks down faster, colors fade, and the fit loosens. None of that is a health problem at normal sauna temps. It's a money problem if you're wearing out a $90 suit every season.

A cotton or linen wrap solves most of it. If you want the security of a swimsuit in a shared room, buy a cheap cotton or cotton-blend suit dedicated to sauna use instead of sacrificing your real swim gear.

One thing to avoid in any swimsuit: chlorine. If you've been swimming, rinse off before you go in. Chlorine-saturated fabric in a 190°F room releases trace chlorine vapor into the air. The concentration in a normal session is low, but a 30-second rinse removes the question entirely.

What should you never wear in a sauna?

A few items are worth leaving outside, full stop.

Metal jewelry. Rings, necklaces, bracelets, and earrings conduct heat fast. Metal reaches the sauna's ambient temperature quicker than your skin does, and a gold ring at 180°F is a burn risk, especially against skin that's already sweating.

Shoes or sandals. Most sauna etiquette bans footwear on the benches, and rubber or foam soles heat up and may off-gas.

Tight elastic waistbands. A snug waistband pressed against hot skin for 15 to 20 minutes gets uncomfortable fast and can leave a red mark. Loose is better.

Contact lenses. Not clothing exactly, but worth flagging. The dry heat of a traditional sauna pulls moisture off the eyes quickly. Contacts through a dry session of 15 minutes or longer can cause real discomfort and, in some cases, minor corneal irritation ^[5]. Glasses or nothing is safer.

Sunscreen. Been outside first? Rinse it off. Sunscreen carries chemical filters, and some aren't tested for stability at sauna temperatures. Direct research here is thin, but heating unknown chemistry against your skin is a bad default.

Smartwatches and fitness trackers. Not a heat-safety issue so much as a warranty one. Water and temperature ratings for most wearables don't cover sustained exposure to 170 to 190°F air, and most warranties exclude sauna heat damage outright.

Does what you wear affect your sweat output or health benefits?

Here's where the marketing around "sauna suits" falls apart. Wearing more clothing in a sauna makes you sweat more fluid. It does not add to the cardiovascular or thermoregulatory benefits research has tied to sauna use.

The 2018 study by Laukkanen and colleagues in Mayo Clinic Proceedings found that frequent sauna use (4 to 7 times per week) was associated with a lower risk of cardiovascular events. Those sessions were traditional Finnish sauna at 80°C (176°F), without heavy clothing ^[6]. The mechanism is raised core temperature and the cardiovascular response to it, not the volume of sweat you produce.

Sweating more fluid in a sweat suit means you weigh less afterward. That's dehydration, not fat loss. The weight comes back the moment you drink. It's why sweat suits for sauna use are popular with athletes trying to make a weight class, and why they do nothing physiologically that a towel session doesn't, except raise your dehydration risk.

So wear the minimum comfort and the rules allow. You get the same core temperature elevation with far less discomfort.

The research on sauna benefits consistently ties outcomes to heat exposure duration and temperature. Not to sweat volume.

What should you sit on in a sauna?

Even if you're comfortable going without clothes, sitting bare on a wooden bench isn't great practice. Upper-bench temps in a traditional sauna can pass 140°F (60°C), and bare skin on that surface for 15 to 20 minutes is genuinely uncomfortable and leaves the bench unsanitary.

A cotton or linen towel between you and the wood fixes both. It soaks up sweat before it sinks into the bench, which matters for hygiene and for the bench's lifespan. Cedar and hemlock look great new. Years of absorbed sweat speed up oxidation and cracking if the wood isn't cleaned.

Some sauna users bring a small personal towel, sometimes called a pestemal (a Turkish flat-weave towel), just for sitting. These run roughly 18 to 24 inches, launder easily, and pack flat. If you're using a portable sauna or a home unit, keep a stack of dedicated sauna towels near the door.

Public saunas in Scandinavia and Germany often hand out wooden bench mats or require you to bring your own towel to sit on. In the U.S. the habit is less universal. Follow it anyway.

Does what you wear change between a sauna and a steam room?

Yes, somewhat. A traditional dry sauna runs 150 to 195°F at very low humidity, often 5 to 20% ^[7]. A steam room runs cooler, usually 110 to 120°F, but near 100% humidity.

In a steam room, moisture saturates whatever you're wearing almost instantly. A heavy cotton towel or thick shorts go soaking wet within a couple minutes, which some people can't stand. Thinner cotton, a lightweight wrap, or a swimsuit work better in steam. The concerns about synthetics still hold, though the lower steam-room temps make off-gassing less likely.

The other difference is hair. Steam saturates it completely, so if you're sensitive to that, a cotton headband or a small towel over the head is common. In a dry sauna hair dries fast between rounds; in a steam room it stays wet the whole time.

For a full comparison of the two environments, including temperature ranges and health research, see sauna vs steam room.

Doing contrast therapy, moving between a sauna and a cold plunge? Wear a swimsuit for the full sequence. Switching from a towel-only setup to a cold plunge works at home but gets awkward fast in any shared setting.

What do women typically wear in a sauna?

The options for women are the same as for anyone: a towel, a swimsuit, a cotton wrap, or nothing, depending on the setting. A few specifics come up more often.

Hair. Long wet hair down your back acts as insulation and can make the session hotter than it needs to be. A loose bun or a small cotton towel wrap handles it. Metal hair clips and pins carry the same burn risk as any other metal.

Bras and underwear. Underwire bras are a bad idea. The wire heats up like any other metal, and the synthetic fabric in most bras doesn't take repeated heat well. A cotton bralette or going without is more comfortable and safer.

In outdoor sauna settings at private homes or retreat properties, women (and everyone) tend to use a towel inside and switch to a swimsuit for any outdoor cool-down or cold plunge. That works cleanly without multiple changes of clothing.

The rule is practical comfort over any particular standard. Your skin needs to breathe, your metal needs to stay off, and whatever you sit on should be washable.

What should kids wear in a sauna?

Kids can use saunas. There's a reasonable evidence base for safe pediatric use in the Finnish literature, where children have used family saunas for generations. The American Academy of Pediatrics hasn't issued specific sauna guidance for children, but the general consensus across the sports medicine and pediatric literature is shorter sessions (5 to 10 minutes maximum) at lower bench positions, where temperatures are meaningfully cooler ^[8].

For clothing, the same rules hold: lightweight cotton or a small towel, no metal, no tight elastic. Kids' swimsuits are often heavily synthetic, so a lightweight cotton option is better once the session runs more than a few minutes.

The bigger concern with children isn't clothing. It's hydration and time. Kids carry a higher body surface area to mass ratio than adults, which means they heat up faster relative to body weight. Short sessions, lower benches, and a cold water bottle ready are the safeguards. If a child says they want out, that's the cue to leave.

How should you dress for a sauna session at a commercial spa or gym?

Most U.S. commercial saunas post rules near the entrance. Read them. The common requirements are a towel or swimsuit, no street clothing, and no shoes on benches. Some facilities hand out towels. Many don't.

A packing list for a public sauna visit:

• One small towel to sit on (hygiene, not optional)
• One larger towel for drying off after
• A cotton or linen swimsuit if nudity isn't permitted
• Flip flops for the locker room and pool deck (not the sauna bench)
• A water bottle, stainless steel or glass rather than plastic that softens at sauna temps

Leave at home: the smartwatch, metal jewelry, sunscreen-covered skin (rinse first), and anything you'd hate to see sweat-damaged.

SweatDecks carries sauna accessories, including towels sized for bench use, if you're outfitting a home setup and want the options in one place.

For anyone building a new home sauna, the clothing question comes after the setup question. Read the home sauna guide before you worry about what to wear in it.

Does going to a sauna after a cold plunge require different clothing?

Contrast therapy, alternating heat and cold, keeps growing in popularity, and so does the research. A review of contrast water therapy in the European Journal of Applied Physiology found that alternating heat and cold water immersion produced greater reductions in perceived muscle soreness than passive recovery ^[9].

The clothing question for contrast sessions is simple: a swimsuit you don't mind getting wet and cold is the easiest choice. Moving between a sauna at 180°F and a cold plunge at 50 to 55°F while wrangling a loose towel is a hassle. A fitted swimsuit stays put during immersion, dries reasonably fast in the heat, and takes the temperature swings without complaint.

If the cold portion is a solo home ice bath, you have more room to improvise. Plenty of people run the full sequence without clothing in private, which stays hygienic as long as you rinse before the plunge and again before heading back into the sauna.

For more on the cold side, see cold plunge benefits.

Frequently asked questions

What to wear in a sauna as a beginner?

Keep it simple. A cotton towel wrapped around your body is the most comfortable and safest first-session option. Less fabric means less trapped heat, lower overheating risk, and you've got something to sit on. If you're at a gym or spa that requires a swimsuit, choose a lightweight cotton or linen suit over synthetic performance fabric.

Can you wear workout clothes in a sauna?

Technically yes, but it's a bad idea. Most workout clothing is polyester or nylon blended with elastane, all of which trap heat against your skin and degrade with repeated exposure above 150°F. Cotton gym shorts are the exception and work fine. Leave anything labeled moisture-wicking, quick-dry, or compression in the locker room.

Do you have to wear a towel in a sauna?

No law of physics requires it. In private saunas it's a personal choice. In public saunas most facilities require you to sit on a towel for hygiene even where they allow nudity. Bring one either way, for the hygiene and because sitting bare on a hot wooden bench for 15 to 20 minutes is uncomfortable without a layer between you and the wood.

Can you wear a robe into a sauna?

A robe is fine for walking to and from the sauna, but wearing one inside is impractical. A thick robe traps heat, raises your core temperature faster than is comfortable, and soaks with sweat within minutes. Take it off before you sit down and leave it on a hook outside the room or just inside near the door.

Should you wear a hat in a sauna?

In Finnish tradition, a woolen sauna hat protects the head and hair from the most intense heat near the ceiling. They genuinely work. If you're sensitive to head heat or sit on the upper bench, a thin wool or cotton cap keeps your head cooler and stretches how long you can comfortably stay in.

Is it bad to wear a bathing suit in a sauna?

Not dangerous, but not ideal. Synthetic swimsuit fabrics don't breathe well and degrade faster with repeated heat exposure. The fit also concentrates heat at the waistband and straps. If you sauna in a swimsuit regularly, buy a basic cotton or cotton-blend suit for that purpose rather than wearing your actual swim gear.

What do you wear in a sauna at a gym?

Most gym saunas require either a swimsuit or a towel. A simple cotton swimsuit or a large cotton towel wrapped around your body meets the rules and keeps you comfortable. Bring a second small towel to sit on, which keeps the bench cleaner and is required at many facilities. Skip the metal jewelry and smartwatch before you go in.

Can you bring a phone into a sauna?

This clothing-adjacent question comes up constantly. Most consumer smartphones aren't rated for sauna temperatures. Apple rates the iPhone for operation up to 95°F (35°C); most sauna rooms run 4 to 5 times that. Heat can damage the battery, distort display adhesive, and in rare cases cause battery swelling. Leave it in the locker room.

What do Finnish people wear in a sauna?

Traditionally, nothing. Finnish sauna culture treats nudity as standard and unremarkable in a family or private setting. Public saunas in Finland are often gender-separated, with nudity the norm in each section. The Finnish Sauna Society, the primary authority on traditional practice, describes the sauna as a space for relaxation and cleanliness, with clothing seen as unnecessary in the heat.

Do you wear clothes in an infrared sauna?

Infrared saunas heat your body directly rather than heating the air, so they typically run cooler (120 to 150°F) than traditional saunas. The same fabric rules apply: cotton or linen is fine, synthetics are less ideal. Some infrared protocols suggest wearing less allows more direct infrared exposure to the skin, though the evidence for that specific claim is thin.

Can you wear underwear in a sauna?

Cotton underwear is fine if you prefer the coverage. Avoid underwire bras because the metal heats up and can cause burns or discomfort. Synthetic underwear made of nylon or polyester traps heat and may feel uncomfortable through a full session. If you're wearing anything, plain cotton is the most sensible choice for a 15 to 20 minute sit.

What towel size is best for sauna use?

Two towels beat one. A small bench towel, roughly 18 by 24 inches, goes under you for hygiene. A larger bath towel, 28 by 55 inches or bigger, handles drying off and wrapping up after. Waffle-weave cotton or thin terry cloth dries faster between rounds than thick hotel-style terry, which matters if you're doing multiple sessions.

Can you wear flip flops or sandals inside the sauna?

Footwear on sauna benches is widely prohibited, and for good reason. Shoe soles bring in dirt and bacteria, rubber and foam get hot and may off-gas, and shoes on a wooden bench damage the surface. Flip flops are fine for the locker room and shower area but come off before you enter the sauna room itself.

Does wearing more in a sauna help you lose weight faster?

No. Heavy clothing or a sweat suit increases fluid loss, which drops your scale weight temporarily through dehydration. That weight returns the moment you rehydrate. There's no credible evidence that wearing more in a sauna increases fat metabolism or produces lasting weight change. The benefits of sauna use come from heat exposure, not sweat volume.

Sources

1. Finnish Sauna Society, official guidance on sauna tradition: Traditional Finnish sauna use is without clothing; the sauna is described as a place for physical and mental relaxation
2. NIST, Textile and Apparel Technology research: Synthetic performance fabrics begin to show structural degradation at temperatures above approximately 150°F (65°C)
3. American College of Sports Medicine, position stand on exercise and heat: Evaporative cooling accounts for the majority of heat dissipation during passive heat exposure; covering skin surface reduces this process
4. Textile Exchange, Preferred Fiber and Materials Market Report: Most modern swimsuits are 80 to 85% nylon or polyester with 15 to 20% elastane
5. National Eye Institute (NIH), contact lens and eye health guidance: Dry heat environments dehydrate the ocular surface and contact lenses can cause discomfort and minor corneal irritation in low-humidity heat exposure
6. Laukkanen et al., Mayo Clinic Proceedings, 2018: Frequent sauna use (4-7 times per week) was associated with reduced risk of cardiovascular events; sessions were traditional Finnish sauna at 80°C (176°F)
7. Harvard Health Publishing, health benefits of sauna: Traditional dry saunas operate at 150 to 195°F with relative humidity of 5 to 20%
8. American Academy of Pediatrics, Pediatrics journal, environmental heat guidance: General pediatric consensus suggests sauna sessions for children should be shorter (5 to 10 minutes) and at lower bench positions where temperatures are cooler
9. Versey et al., European Journal of Applied Physiology, contrast water therapy review: Alternating between sauna heat and cold water immersion produced significantly greater reductions in perceived muscle soreness compared to passive recovery
10. Apple Inc., iPhone environmental specifications: Apple rates the iPhone for operation up to 95°F (35°C), well below typical sauna operating temperatures