Why do people wear sauna hats?

Spend an evening in a Finnish or Estonian sauna, or a Russian banya, and you'll see grown adults in pointed felt hats that look like they came from a fairy tale. They're not a joke. The hat has a simple job, and once you've tried one on the top bench you'll understand why people bother.

Why your head gets hottest

Hot air rises, so a sauna is layered like a cake, coolest at the floor and hottest under the ceiling. The usual guidance for a Finnish sauna is 80–100 °C (176–212 °F) at the level of your head, with lower temperatures near the floor. When you sit on the top bench, your head is in the hottest layer and your feet are in a cooler one.

A 2026 study from the University of Jyväskylä in Finland measured this in practice. The saunas were set to about 75 °C (167 °F), and the air around the bathers averaged about 51 °C (124 °F) at sitting height but about 69 °C (156 °F) at head height. That's a difference of nearly 20 degrees across the length of a seated body.

So the part of you that feels heat most sharply, with thin skin on the face, ears and scalp, is in the hottest air. For some people, a hot head is what drives them out of the sauna long before the rest of the body has had enough.

What the hat does

Felt is wool that has been pressed and matted until it's thick and dense. It traps a layer of air, and air is a poor conductor of heat. On your head it works much like a tea cosy in reverse: it slows the heat getting in.

That's the whole trick. The hat doesn't cool you down, and it doesn't change how much your body heats up overall. It just takes the edge off the hottest spot, so your head and the rest of you warm up at a more even pace. People who wear them often say they can sit a few minutes longer, and that the hit of heat from a ladle of water on the stones feels less fierce on the ears.

Two other reasons people give:

• Hair. Hot, dry air dries out hair. A hat keeps the worst of it off. This makes sense, though nobody has measured it.
• Ears. Ears have little to protect them and can feel uncomfortably hot when someone throws water on the stones. A hat pulled down over them helps.

Be wary of grander claims. Some sellers say a hat prevents dizziness or headaches. There's no research testing that, and if you feel dizzy in a sauna the answer is to get out, hat or no hat. Our guide to how long to stay in a sauna lists the warning signs.

Wool, felt or linen

• Wool felt is the classic. It's thick, holds its shape, insulates well and copes with high heat.
• Knitted wool or merino is softer and lighter, and easier to fold into a bag.
• Linen or cotton is thinner and cooler. Fine for a milder sauna or an infrared cabin, less useful at 90 °C (194 °F).

Avoid synthetic beanies and fleece. They aren't made for that heat and can soften or melt. A folded cotton towel on your head is a reasonable stand-in if you don't have a hat.

How to wear one

1. Dampen it. Dip the hat in cool or lukewarm water and squeeze it out before you go in. Many regulars do this. A damp hat feels cooler at first, and wool still insulates when slightly wet.
2. Put it on before you get hot. Pull it down over your ears and forehead.
3. Take it off between rounds. Let your head cool properly in the shower or the cold plunge, then put the hat back on for the next round.
4. Don't share it. It soaks up sweat like a towel does.

Pack it with the rest of your kit. Our checklist of what to bring to a sauna has the rest.

How to wash a sauna hat

• After each visit, rinse it in cool water and hang it to dry in a place with air around it. Don't leave it balled up in a wet bag.
• Every so often, hand wash it in cool water with a little wool detergent.
• Squeeze the water out gently. Don't wring or twist it.
• Reshape it while it's damp and dry it flat or over a bottle.
• Never use a hot wash or a tumble dryer. Heat plus movement shrinks felt, which is how felt is made in the first place.

Where people wear them

Felt hats are part of everyday sauna culture in Finland and Estonia, and across the Nordic and Baltic countries. In Russia a banya hat is standard kit, often sold as a set with matching felt mitts. Some large spas in Germany, Switzerland and the Netherlands now have banya rooms too, as the venues below show, and that's where you're most likely to see hats outside the Nordic and Baltic countries. If you're curious about the Russian version of the sauna, read our guide to the Russian banya.

Do you need one?

No. Plenty of lifelong sauna users never wear a hat. If you like a mild sauna, sit on the lower benches or keep your rounds short, you may not notice much difference. A hat makes most sense if you like the top bench, enjoy plenty of steam, or find your head gets uncomfortable well before the rest of you. They're cheap, so it's an easy thing to try. For the numbers behind the different kinds of sauna, see how hot is a sauna.

Where to try a banya

Find My Sauna lists 51 places with a banya, the room where felt hats are most at home. These cities have the most:

Sole Uno

Basel · Banya and Finnish saunas

Suomi-Sauna im Familienbad Niederheid

Düsseldorf · Banya and Finnish saunas

Thermen Maarssen

Utrecht · Banya and spa

Frequently asked questions