What to Wear in a Sauna: Safe and Unsafe Clothing

Why Knowing What to Wear in a Sauna Helps

Most people spend more time thinking about what playlist to bring to their sauna session than what they're actually wearing to it. That's a mistake because what you put on your body before stepping into that heat directly affects how much you sweat, how safe you are, how comfortable you feel, and how welcome you make the people around you.

Regardless of whether you're a first-time visitor to an infrared sauna at the gym or a seasoned traditional home sauna user upgrading your routine, the right attire is one of the simplest ways to get more out of every session. The wrong choice (synthetic fabrics, tight-fitting clothes, metal jewelry) can restrict sweat, trap heat in dangerous ways, and in some cases cause burns or release harmful chemicals at high temperatures.

The short answer: a towel, a swimsuit made from natural fibers, or purpose-built sauna clothing are your best options. No synthetics, no metal, no street clothes. But the full answer depends on the type of sauna you're using, the setting you're in, and your personal preference. Here's everything you need to know.

Why Dressing Appropriately for a Sauna Matters

The goal of any sauna session is to raise core body temperature, trigger sweating, and support the health benefits that follow. Research links regular sauna use to significant reductions in cardiovascular risk, but only when the body can thermoregulate freely. Clothing that traps heat or blocks sweat evaporation works directly against that process. 

Beyond the physiological, attire matters in shared spaces. Public and gym saunas are communal environments. What you wear affects the hygiene and comfort of everyone else in the room. Most commercial facilities have dress codes for exactly this reason.

Three things are at stake with every session:

• Heat circulation: loose, breathable clothing lets thermoregulation work; heavy or restrictive fabrics fight it.

• Sweat evaporation: natural fibers wick and release moisture; synthetics trap it against your skin.

• Shared space hygiene: appropriate attire protects wooden benches, reduces bacterial growth, and respects other users.

For the full picture on what sauna heat does for the body, see our guide on infrared sauna benefits.

What to Wear in a Sauna: Your Best Options

The right choice comes down to the setting, your comfort, and the type of sauna you're walking into.

A Towel

The towel is the most traditional and widely accepted option across sauna cultures worldwide, and it remains the gold standard for good reason. In Finnish saunas, the origin of modern sauna practice, a single cotton towel wrapped around the body or laid across the bench, is the norm.

A clean towel serves two functions simultaneously: it absorbs sweat from your body and protects the wooden sauna benches from direct skin contact, which is both a hygiene requirement and a standard of sauna etiquette in most shared facilities. It allows maximum airflow and heat circulation to the skin, supports sweat evaporation, and puts no restriction on your body temperature regulation.

Best for: Traditional dry saunas, Finnish saunas, and anyone who wants the most effective, unobstructed sauna experience.

Tip: Bring a dedicated sauna towel separate from your shower towel. Wash it after every use.

A Swimsuit or Bathing Suit

A loose-fitting swimsuit is the most popular option in gym saunas, spa facilities, and public saunas in North America, and in many cases, it's required. Most commercial sauna facilities mandate coverage, making a swimsuit or bathing suit the practical default for use in public settings.

Choose lightweight, loose-fitting swimwear made from natural materials; cotton or linen blends are ideal. Avoid dark colors, which absorb and retain heat more than light colors, and avoid tight-fitting styles that compress the skin and restrict blood flow.

One important caveat: many standard swimsuits are made from synthetic fabrics like polyester, nylon, or spandex. These are fine in a pool but problematic in a sauna (more on that later). Look at the label before you go in and opt for a loose-fitting cotton or natural-fiber swimsuit wherever possible.

Best for: Gym saunas, mixed-gender public saunas, and spa facilities that require coverage.

Sauna-Specific Clothing

Purpose-built sauna clothing, such as sauna kilts, sauna wraps, sauna shorts, and linen wraps, is growing in popularity, particularly among home sauna users and those building a dedicated sauna routine. These are made from natural fibers (typically cotton or linen) that are specifically designed to withstand repeated exposure to high heat and moisture without degrading or releasing chemicals.

Sauna-specific clothing offers more coverage than a towel but far more breathability than a standard swimsuit. They are a great choice for anyone who wants a dedicated, comfortable option that can be washed regularly and lasts through frequent use.

Best for: Home saunas, regular sauna users, anyone who wants purpose-built attire beyond a towel.

Going Au Naturel

In Finnish saunas, Scandinavian spa culture, and many European wellness facilities, nudity is not just accepted. It is the standard. It is considered the most hygienic option because no fabric traps sweat against the skin, and it allows the body to thermoregulate with complete freedom.

Cultural norms vary significantly by setting and country. Nudity could be appropriate in private home saunas, clothing-optional facilities, and many European spa environments. It is generally not appropriate in North American gym saunas or most commercial public saunas, where swimwear is required.

Regardless of whether you go nude or not, always sit on a clean towel. This is the most important hygiene practice in any shared sauna space, full stop.

What to Wear in a Sauna for Men

Loose-fitting cotton or linen sauna shorts, or a wrapped towel, are the most practical options. If you prefer shorts, go for a relaxed fit rather than anything athletic. Avoid compression shorts, cycling shorts, or synthetic gym wear, as these restrict blood flow and impede sweat evaporation, undermining the purpose of the session. A light cotton boxer-style short works well if you're not comfortable with just a towel.

What to Wear in a Sauna for Women

A cotton wrap, linen wrap, or lightweight loose swimsuit are the most comfortable choices. Avoid underwire bras at all costs; metal conducts heat rapidly and can cause burns or significant discomfort within minutes at sauna temperatures. A soft cotton sports bra or a sauna wrap that ties at the chest is a far better option. Keep a hair tie handy, too; wearing hair up reduces heat retention around the neck and face and keeps things more comfortable throughout the session.

Sauna Accessories Worth Knowing About

• Sauna hat: A wool or felt hat insulates the head (the most heat-sensitive part of the body) from ceiling-level heat, letting you stay in longer and more comfortably. Widely used in traditional Finnish saunas and well worth trying.

• Flip flops or sandals: For the locker room and changing area only. Never inside the sauna itself. Shoes do not belong on sauna benches or floors.

• Water bottle: Keep it outside the sauna room. Hydrate well before and after every session, not just when you feel thirsty.

• Sauna bag or tote: A dedicated bag keeps towels, clean clothes, and post-session essentials organized and separate from your gym gear. Leave it in your locker or changing area, and bring only your towel into the sauna itself.

What Not to Wear in a Sauna

Synthetic Fabrics

Polyester, nylon, spandex, and Lycra trap heat against the skin, restrict sweat evaporation, and can release chemical compounds at high temperatures. According to research, synthetic textiles shed significantly more microplastics under heat and friction. Most athletic wear and compression gear fall into this category. Leave it in the locker room and wear it after your session.

Swimwear With Metal Components

Underwire bras, metal clasps, and rivets conduct heat rapidly and can cause burns within minutes at traditional sauna temperatures. Strip back to simple, soft, natural-fiber swimwear. When in doubt, simpler is always safer.

Jewelry and Metal Accessories

Rings, necklaces, earrings, and watches conduct heat and become uncomfortable (or dangerous) quickly. Remove all metal, including your phone, before entering. Contact lenses can also dry out painfully in the low-humidity environment of a dry sauna. 

Heavy Clothing and Street Clothes

Jeans, hoodies, and t-shirts trap heat unsafely, saturate with sweat quickly, and are unhygienic in shared spaces. This is a hard rule in virtually every commercial sauna facility, not a soft guideline.

Makeup, Fragrances, and Shoes

Makeup clogs pores and prevents effective sweating—one of the core reasons to use a sauna. Remove it before entering. Strong perfumes become overwhelming in enclosed heat and are one of the top etiquette complaints in shared sauna settings. And shoes: sandals stay in the changing room, always.

Using the sauna as part of a post-training routine? Our guide on sauna after workout covers timing, duration, and recovery-focused session structure. 

What to Wear in an Infrared Sauna

Infrared saunas run cooler, typically 110–150°F versus the 150–195°F of traditional saunas, but skin exposure matters more, not less. Because infrared light penetrates tissue directly rather than heating the surrounding air, more exposed skin means more effective therapy. Lightweight cotton shorts and a tank top are a comfortable and practical choice at these lower temperatures.

Quick reference for infrared sauna attire:

• Lightweight cotton shorts and a tank top or sports bra work well at infrared temperatures.

• Expose as much skin as is comfortable; infrared light works best with direct skin contact.

• The same rules apply: no synthetics, no metal, nothing tight-fitting, even at lower temperatures.

If EMF exposure in an enclosed space is a concern, our guide on EMF levels in infrared saunas covers what the research actually shows. 

What to Wear in a Steam Room

Also curious about what you should wear in a steam room? Steam rooms run at near 100% humidity, which changes how clothing behaves entirely; fabric saturates fast and stays wet for the duration of your session. A lightweight swimsuit or simple towel wrap is the standard. Anything heavy or clingy when wet makes the experience miserable rather than restorative, so lean toward minimal and quick-drying.

Avoid metal, avoid synthetics, and check the facility's dress code before you arrive. Most steam room facilities share similar policies with their dry sauna areas. 

Hygiene and Sauna Etiquette

• Shower before entering. Standard in Finnish and European sauna culture. Removes body oils, sweat, and product residue before sitting on shared wooden surfaces.

• Always sit on a towel. Non-negotiable in any shared space. Protects the wood and prevents bacterial growth on benches.

• Wash sauna clothing after every use. Damp, sweaty fabric left unwashed breeds bacteria. Keep a dedicated set and wash it consistently.

• Cool down between rounds. A cold shower or cold plunge is part of the traditional ritual and helps you extend your session safely. Stick to 15–20 minutes per round.

FAQs on Appropriate Sauna Clothing

Do you wear underwear in a sauna?

Not recommended, especially synthetic underwear. If you want coverage, a loose cotton swimsuit or sauna wrap handles high heat far better. Regular underwear is designed for everyday conditions, not sustained heat exposure.

Should you bring a change of clothes after a sauna?

Always. Your body continues sweating for several minutes after a session as it cools down. A clean, dry change of clothes is both more comfortable and more hygienic than putting your pre-sauna clothes back on.

What do you wear on your feet?

Nothing inside the sauna. Flip flops are for the locker room, shower area, and changing room only; not for sauna benches or floors.

Can you wear a towel and a swimsuit at the same time in a public sauna?

Yes, and it's common. A swimsuit for coverage, plus a towel to sit on, covers modesty and hygiene simultaneously. No rule against combining both.

Can you wear leggings in a sauna?

No. Leggings are almost always synthetic (polyester or spandex), which traps heat, blocks sweating, and can release compounds at high temperatures. They are not appropriate sauna wear.

Do sauna attire rules vary by country?

Significantly. Nudity is the norm in Finland and Scandinavia; swimwear is expected in most public facilities in North America and Asia. Know the cultural norms before you arrive. What's polite in one country can be out of place in another.

What to Wear in a Sauna: Conclusion

Three principles cover everything: let your body breathe, support effective sweating, and respect the shared space. A cotton towel, a loose natural-fiber swimsuit, or purpose-built sauna clothing checks all three. Synthetics, metal, heavy fabrics, and street clothes check none of them.

The sauna type matters too. Infrared rewards more skin exposure, steam rooms call for minimal quick-drying coverage, and traditional Finnish saunas work just as well with a single towel as with a purpose-built wrap. Get the attire right, and the heat, the sweat, and the recovery all work better.

If you’re looking for a sauna to use at home, at a gym, or other commercial facilities, browse our traditional sauna collection and infrared sauna collection at Strength Warehouse USA to find the right fit for your space and goals.

References

Hartline, N. L., Bruce, N. J., Karba, S. N., Ruff, E. O., Sonar, S. U., & Holden, P. A. (2020). Microfiber masses recovered from conventional machine washing of new or aged garments. Environmental Science & Technology, 50(21), 11532–11538. https://doi.org/10.1021/acs.est.6b03045

Laukkanen, T., Kunutsor, S. K., Zaccardi, F., Lee, E., Willeit, P., Khan, H., & Laukkanen, J. A. (2018). Acute effects of sauna bathing on cardiovascular function. Journal of Human Hypertension, 32(2), 129–138. https://doi.org/10.1038/s41371-017-0008-z