Short answer: wear as little as the venue calls for, a towel wrapped around you or swimwear where it is required, and stick to natural fibers that handle heat well. Many regulars also add a wool sauna hat to protect their head and get more out of the session.
Key takeaways
- Most public saunas call for a towel or swimwear. The exact norm depends on the venue and the country, so check before you go.
- Natural fibers (cotton, linen, wool) handle heat and moisture far better than synthetic fabrics.
- Skip metal jewelry. Rings, chains, and piercings heat up and can burn skin.
- Heavy synthetic athletic wear traps heat and moisture instead of letting your body cool the way it is supposed to.
- A wool sauna hat is the one accessory worth adding, since it protects your head and hair from the hottest air in the room.
What you actually wear depends on the venue
There is no single dress code for a sauna, because norms vary widely by venue and by country. Here is how it typically breaks down.
Public gyms and fitness centers (US and UK): Swimwear or gym clothes plus a towel is standard, and most gym saunas expect you to sit on the towel rather than directly on the bench.
Spas and wellness centers: Policies vary by spa. Some provide robes and expect swimwear underneath, others are more relaxed, so when in doubt, ask at the front desk.
Traditional Finnish and Nordic saunas: In Finland and much of Scandinavia, sauna nudity is common and considered completely normal, especially in single-sex or private saunas, though a towel is still used to sit on.
German and Central European saunas: Many countries in Central Europe, including Germany and Austria, actually require nudity in mixed-gender saunas as a hygiene rule, since swimwear is seen as unhygienic. Signs are usually posted.
Home saunas: Whatever is comfortable. Since it is your own space, you can wear a towel, swimwear, or nothing at all, and it is where a lot of people get the most consistent use out of proper sauna gear like a hat, since there is no dress code to navigate.
Whatever you choose, keep it minimal and breathable, and check the specific venue's rules before you go rather than assuming.
Why natural fibers beat synthetics in the heat
Whatever you wear, from a towel to a hat, the material matters more than people expect. A sauna is a hot, humid, repeatedly-soaked environment, and different fibers handle that very differently.
Natural fibers like cotton, linen, and wool breathe. They move moisture away from your skin instead of trapping it, and they hold up to being soaked and dried over and over. Wool in particular is naturally heat-resistant and antimicrobial, which is why it is the standard material for the one dedicated piece of sauna clothing: the sauna hat. Our comparison of wool vs felt vs synthetic sauna hats breaks down exactly why natural fiber wins on every measure that matters in a hot room.
Synthetic fabrics do the opposite. Polyester and nylon do not breathe well in sustained heat, so they trap moisture against your skin and make the heat feel harsher than it needs to. That is part of why heavy synthetic athletic wear is worth leaving at the door.
What to avoid wearing in a sauna
A few categories of items are worth skipping entirely, regardless of which venue you are in.
- Metal jewelry. Rings, necklaces, watches, and piercings heat up fast and can burn your skin. Take metal off before you go in.
- Heavy synthetic athletic wear. Thick leggings and compression gear trap heat and moisture instead of letting your body regulate itself.
- Makeup and heavy lotions. Heat opens your pores, and makeup or thick lotion can clog them and is uncomfortable once you start sweating.
- Regular shoes or sneakers. Most saunas expect bare feet or sandals only, for hygiene and comfort.
- Wet swimwear straight from a pool. Chlorinated, dripping swimwear is what German-style dry saunas prohibit, and wet fabric against hot wood is poor etiquette anywhere.
Wear this, avoid this
| Wear this | Avoid this |
|---|---|
| A towel (to sit on and to wrap in) | Metal jewelry, rings, and watches |
| Swimwear where required by the venue | Heavy synthetic athletic wear |
| Natural fibers: cotton, linen, wool | Makeup and thick lotions |
| A wool sauna hat | Regular shoes or sneakers |
| Bare feet or sandals | Dripping wet swimwear straight from the pool |
The case for a wool sauna hat
Once you have the basics sorted (a towel or swimwear, natural fibers, nothing metal) the one accessory worth actually adding is a wool sauna hat. The air at head height in a hot room is the hottest air in the entire space, and a wool hat creates an insulating buffer that keeps your head from overheating before the rest of your body has had a proper session. Our explainer on do sauna hats actually work and our full list of sauna hat benefits lay out the mechanism, including how it can help protect your hair from the same dry heat that dehydrates your skin.
Once you have decided to wear one, using it correctly makes a real difference. Our guide to how to use a sauna hat covers the simple routine: on dry before the hot room, worn through the session, off for the cold plunge.
The Felty take
What you wear in a sauna comes down to two things: matching the venue's norms, and choosing materials that work in the heat. A towel or swimwear covers the first. Natural fiber, especially a genuine wool sauna hat, covers the second. Felty makes the Original Wool Sauna Hat in 100% premium wool, handcrafted in small batches for exactly this environment. If you are putting together your sauna kit, shop our wool sauna hats and start there.
Frequently asked questions
What should you wear in a sauna at the gym?
At most public gyms in the US and UK, swimwear or gym clothes plus a towel is standard, and you should sit on the towel rather than directly on the bench. Some gyms are stricter about coverage than others, so a quick glance at posted rules helps the first time you visit a new facility.
Is it normal to be naked in a sauna?
It depends on the country and venue. In Finland and much of Scandinavia, sauna nudity is common and normal, especially in single-sex saunas. In Germany, Austria, and similar Central European saunas, nudity in mixed saunas is often the actual rule, since swimwear is considered unhygienic. In most US and UK public settings, swimwear plus a towel is the norm instead.
Can you wear jewelry in a sauna?
It is best to take metal jewelry off before you go in. Rings, necklaces, watches, and metal piercings heat up quickly and can burn your skin. Leave metal in a locker or bag rather than on your body.
Should you wear a hat in the sauna?
Many regulars do, specifically a wool sauna hat rather than a regular hat or beanie. The hottest air in a sauna sits at head height, and a wool hat creates a buffer that keeps your scalp from overheating. See why wear a sauna hat for the full reasoning.
What fabric is best for sauna clothing?
Natural fibers: cotton, linen, and especially wool. They breathe, manage moisture instead of trapping it, and hold up to repeated heat and soaking. Synthetic fabrics like polyester do the opposite, which is why they are worth avoiding in the hot room.