Best Sauna Hats 2026: How to Choose Wool, Felt or Merino

A felt hat in a 180°F room sounds backwards, but walk into almost any Finnish sauna or Russian banya and you will see them. A sauna hat is one of the cheapest upgrades you can make to a sauna session. Here is why people wear one, what to look for and how to care for it.

Why wear a hat in the sauna?

Hot air rises, so a sauna is not one temperature. The air near the ceiling, where your head is on the top bench, is the hottest in the room, while your feet sit in much cooler air. Your head and hair take the brunt of that heat. A thick wool or felt hat insulates your head from the hottest layer of air, so you can sit higher and stay comfortable for longer.

A hat also protects your hair from the dry heat, and it keeps sweat off your face on the way out.

Do sauna hats work?

Wool and felt are good insulators, and that is all a sauna hat has to do. You will notice the difference most on the top bench, after you throw water on the stones and the löyly rolls along the ceiling. A cotton cap does not do the same job, because it soaks up sweat, heats through and holds hot water against your scalp.

Wool, felt or merino?

• Wool felt: the classic banya hat. Thick, stiff and slow to heat through. Often 3 mm or more.
• Merino wool: softer and lighter, often seamless or knitted. Comfortable for longer sessions and easy to pack.
• Linen and cotton blends: light, but they heat through faster than wool.

How to choose the best sauna hat

• Thickness: thicker felt insulates better.
• Coverage: bell and bucket shapes cover your ears and the back of your neck. Beanies sit closer and pack smaller.
• Fit: felt hats often run large. Wet the hat and shape it on your head for a closer fit.
• Style: plain, embroidered or fun shapes like the Viking horn hat all work the same way. Pick one you will actually wear.

Browse our sauna hats, from merino beanies to thick banya-style felt.

How to wash a sauna hat

• Rinse it in cool water after a session and squeeze gently. Do not wring it.
• Reshape it and let it air dry, away from the heater.
• Hand wash in cold water with a little wool wash when it needs a proper clean.
• Never put a wool hat in a hot wash or a tumble dryer. It will shrink.

What else to bring

A hat pairs well with a towel to sit on and a robe for the cool-down. See what to wear in a sauna and our sauna robes and towels.

FAQ

What is a sauna hat for?

It insulates your head and hair from the hottest air near the sauna ceiling, so you can stay comfortable on the top bench.

Should a sauna hat be wet or dry?

Either works. Some people dip the hat in cool water before going in. A dry hat insulates well too.

What is the best material for a sauna hat?

Wool. Thick wool felt is the traditional choice, and merino is a softer option.