What to wear in a sauna (and what to avoid)

What you wear in a sauna depends mostly on two things: whether you’re at home or in a public venue, and the local custom of that place. The one item that applies almost everywhere is a towel — both to sit on and to dry off with. Everything else is a matter of comfort, hygiene, and respecting the rules where you are.

The short answer

There’s no single dress code that fits every sauna. At home you have complete freedom. In a public sauna, gym, or spa, the norm is usually a clean towel, light cotton, or swimwear — but it varies by venue, and some are textile-free while others require swimwear. When in doubt, look for posted rules or ask staff. The safest default anywhere is to bring a towel, keep clothing minimal and breathable, and leave metal and electronics outside.

The towel rule

If you remember one thing, make it this: always sit on a towel. It’s the single most important habit in any sauna, for two reasons:

• Hygiene. A towel keeps your sweat off shared benches, which matters enormously in public saunas and is just good practice at home.
• Comfort. Wooden benches get hot. A towel gives you a cooler, softer surface to sit on.

Bring a second towel for drying off when you step out. Many regular sauna-goers carry two as a matter of routine: one to sit on, one to stay dry.

At a public sauna, gym, or spa

Shared saunas are where dress norms matter most, because you’re sharing space with strangers and the venue sets the rules. The typical options are:

• A towel wrap — simple, breathable, and accepted almost everywhere.
• Light cotton — a clean cotton t-shirt or shorts if you prefer more cover.
• Swimwear — common at pools, gyms, and co-ed spas.

The key is to check the venue’s policy. Some saunas are textile-free by tradition and ask you not to wear swimwear; others require swimwear and won’t permit nudity. Neither is right or wrong — they’re just different house rules, and following them is basic courtesy. Whatever the dress code, sit on your towel either way.

At home or in a private sauna

In your own sauna, you set the rules. Most people use a towel to sit on and then wear either a towel wrap, light cotton, or nothing at all. The focus shifts entirely to comfort and hygiene rather than etiquette. The only real guidance is to avoid heavy or synthetic clothing that traps sweat — but that’s about your own comfort, not anyone else’s expectations.

Fabrics: what works and what to avoid

If you wear anything beyond a towel, the material matters more than the style. Heat and sweat expose the weaknesses of the wrong fabrics quickly. Here’s a simple guide:

A few specifics worth calling out:

• Metal gets hot. Jewellery, watches, belt buckles, and underwire can heat up against the skin. Remove jewellery and leave it with your things.
• Electronics don’t belong inside. Phones and smartwatches can be damaged by heat and humidity — leave them outside.
• Skip the lotions and makeup. They can clog pores in the heat and leave residue on benches. Arriving with clean skin is more comfortable and more hygienic.
• Contact lenses can dry out in the low humidity of an infrared sauna or the dry heat of a traditional one. If your eyes feel scratchy, glasses (left to one side, since frames can warm up) may be the better call.

Nudity and etiquette: cultural context matters

How much you wear in a sauna is shaped heavily by culture, and there’s no universal standard. In Finland and much of Germany, sauna use is traditionally nude and entirely unremarkable — it’s seen as the natural, hygienic way to bathe. In many public venues in the US and UK, swimwear or a towel wrap is the expectation, and nudity may not be permitted at all.

None of these customs is more “correct” than another. The respectful approach is simple: follow the house rules of wherever you are, and don’t assume your home custom travels with you. If you’re unsure, a towel wrap is almost always acceptable and lets you adapt to the setting. And whichever way a venue leans, the towel-to-sit-on rule still applies.

Swimsuits: a few practical notes

Swimwear is fine in plenty of saunas, but it comes with two small caveats. First, rinse off chlorine before you go in — pool chemicals can release a faint odour in the heat, which is unpleasant for you and everyone else. Second, synthetic swimsuit fabrics aren’t ideal in very high heat; they don’t breathe the way cotton does and can feel clammy. A quick rinse and a dry suit solve most of this. If a venue allows it and you find swimwear uncomfortable, a towel wrap is often the more relaxed choice.

Infrared vs traditional: a clothing note

The type of sauna can nudge what you wear. In an infrared sauna, the panels warm your body directly rather than heating the air, so less clothing means more skin exposed to that direct warmth — many people wear very little for that reason. A traditional sauna heats the air around you, so coverage matters less to the experience and comes down to comfort and venue rules. If you’re weighing the two heat styles, our guide to infrared vs traditional saunas breaks down how each one actually feels.

Hygiene before and after

Good sauna habits start before you walk in. A quick shower beforehand rinses off sweat, lotion, and product, so you arrive clean — it’s expected etiquette in many shared saunas and just sensible at home. Afterward, dry off with your second towel and rehydrate, since you’ll have sweated out a fair amount of fluid. Hydration is part of using a sauna well, and it ties directly into how often you should use a sauna and how long each session runs.

The bottom line

There’s no strict uniform for the sauna — just a few sensible habits. Always sit on a towel, keep anything you wear loose and breathable, leave metal and electronics outside, and follow the rules of wherever you are. At home, comfort is the only rule that matters; in public, a towel, light cotton, or swimwear covers nearly every venue. Get those basics right and you can relax into the heat without a second thought. If you’re setting up your own space, see the home saunas we recommend to get the foundation right.