Most sauna rules are etiquette, not safety. Knowing which is which is the difference between being comfortable in a sauna and being the person everyone quietly resents. This page separates the two: what varies by culture and venue, what is fixed everywhere, and the handful of rules that exist because ignoring them is genuinely dangerous.

What do you wear in a sauna?

It depends entirely on where you are, and the honest answer is that there is no universal rule. What is standard in Helsinki is prohibited in Dubai, and both are correct in context.

Setting	Normal practice
Finland, traditional	Nude, gender-separated. Textiles are considered unhygienic in the heat.
Germany, Austria	Nude in mixed public saunas. A towel is for sitting on, not wearing.
UAE, Gulf hotels	Swimwear required, gender-separated facilities common
UK, USA hotel spas	Swimwear or a towel, mixed use
Private home sauna	Whatever the household prefers

Three things hold everywhere regardless of dress code. Sit on a towel — it protects the timber from sweat and it is the single most universal courtesy in sauna culture. Shower before you go in, because cosmetics, sweat and sunscreen bake into the wood and the smell stays. And take off metal — jewellery and watches reach painful temperatures faster than you expect.

What not to wear: gym clothes, anything synthetic, and shoes. Polyester traps heat against the skin and does not breathe, which makes the session both less pleasant and less effective.

Do I have to be naked?

No, and nobody in a commercial UAE, UK or US facility will expect you to be. Public nudity is not permitted in Gulf spas at all. In northern Europe the expectation runs the other way, but even there a towel wrapped around you is accepted rather than confronted.

The practical rule when travelling: look at what everyone else is doing on the way in. Sauna cultures are unusually forgiving of visitors who are quietly observant and unusually unforgiving of loud confidence.

The rules that are actually about safety

A short list, and it is worth knowing which items are non-negotiable:

• No alcohol. This is the one that kills people. Alcohol impairs thermoregulation and judgement simultaneously, and it is implicated in a meaningful share of sauna-related deaths in countries where both are common.
• Come out when you feel unwell, not when the clock says to. Dizziness, nausea and headache are exit signals, not something to sit through.
• Stand up slowly. Blood pressure is genuinely lower after heat, and the moment you stand is when people faint.
• Drink water before and after, not during. You lose fluid you will not feel losing.
• Do not sleep in a sauna. You cannot notice you are overheating while unconscious.
• Children need supervision and much shorter sessions. Their thermoregulation is less developed than an adult’s.
• If you are pregnant, or have a heart condition, ask a doctor first. See our guidance on sauna and blood pressure for what heat does to the cardiovascular system and who should be careful.

The rules that are etiquette

These will not hurt you. Breaking them will simply mark you out.

Silence is the default in Finland and Germany. A sauna is closer to a library than a bar. In Anglo and Gulf hotel spas quiet conversation is normal, but volume rises to meet the room, so let the room set it.

Do not pour water without asking if others are present. Adding water raises perceived temperature sharply, and what is pleasant to you may end someone else’s session. In a public sauna, ask.

Phones stay outside. Beyond the social objection, heat and humidity are genuinely bad for them.

Do not stare, and do not shave, exfoliate or groom. A sauna is not a bathroom.

Close the door quickly and do not prop it open. Heat and steam leave in seconds and take several minutes to recover.

Wipe your bench down when you leave. In much of Europe this is expected rather than admirable.

How long, how hot, how often?

The parameters that recur in both tradition and research: 80-90 °C, 15 to 20 minutes per session, with a cool-down between rounds. Two or three rounds is a normal full session.

Longer is not better, and this is the mistake newcomers make most often. The physiological response is largely complete within twenty minutes; sitting for forty produces more strain, not more benefit. Frequency is the variable that matters — see how often you should use a sauna and how long you should stay in for the detail.

First time in a sauna? Do this.

1. Shower, dry off properly. Wet skin sweats less efficiently.
2. Sit on the lower bench for your first round. The difference between the top and bottom bench can be 30 °C.
3. Give it 8 to 10 minutes rather than trying to match anyone else.
4. Cool down properly — cool shower, fresh air, or a plunge if you are comfortable with it and have no cardiovascular reason not to.
5. Rest for as long as you were in the heat before deciding on a second round.

Nobody is assessing you. The person on the top bench for twenty minutes has been doing this for years.

Rules that change when it is your own sauna

In a private home sauna most etiquette dissolves. What replaces it is maintenance, and it is the part owners underestimate:

• Always sit on a towel — sweat in untreated timber is what makes an old sauna smell.
• Ventilate after use. Leave the door ajar and let the cabin dry. Trapped moisture is what damages a cabin, not heat.
• Do not use soap or chemical cleaners on the benches. They soak in and then vaporise. Water and a stiff brush.
• Never pour water on an infrared panel or a heater not designed for it. Only a heater with a rock cavity is built for löyly.
• Keep the rocks clean and replace them. They crumble over time and choke airflow through the heater, which is a slow, invisible way to lose performance.

If you are planning a cabin, the two decisions that shape everything else are the heater type and the ventilation path. Both are much harder to change later than any finish.

Frequently asked questions

Can you wear clothes in a sauna? Yes in most commercial venues, and swimwear is required in Gulf and many UK and US facilities. Avoid synthetics — they trap heat against the skin. In traditional Finnish and German saunas the convention is nude with a towel to sit on.

Should you shower before or after a sauna? Both. Before, so cosmetics and sweat do not bake into the timber, and because clean dry skin sweats more efficiently. After, to cool down and rinse off.

Is it rude to talk in a sauna? In Finland and Germany, largely yes — quiet is the default. In hotel spas elsewhere, low conversation is normal. Let the existing volume in the room guide you.

Can you bring a phone into a sauna? No. It is a social breach almost everywhere, and the heat and humidity will damage the device.

What should you not do in a sauna? Drink alcohol, sleep, ignore dizziness, stay past the point of discomfort, pour water without asking in a shared sauna, or stand up quickly on the way out.