Sauna Hats: Why the Scene Wears Them (UK 2026)
A sauna hat keeps your head cooler so you can sweat longer. Here's why wool felt works, how to care for one, and what to look for when buying in the UK.
What is a sauna hat and why wear one?
A sauna hat is a simple thick cap, almost always made of wool felt, that you wear on your head inside a hot sauna. It looks quirky if you have never seen one, but it does a real job: it protects the most heat-sensitive part of your body. Your head sits at the top of the sauna where the air is hottest, and your scalp and ears feel that heat quickly.
By insulating your head, a sauna hat keeps you comfortable for longer and stops your hair drying out in the fierce dry heat. It is not a gimmick but a piece of traditional kit, standard in Finnish sauna and Russian banya culture for generations, and now a common sight on the UK's booming beach-sauna scene.
How does a sauna hat keep you cool?
It comes down to insulation. Wool felt (a dense non-woven fabric made by matting wool fibres together, described in the material sense of felt) traps a layer of air against your head. That air barrier slows the transfer of heat from the hot sauna to your scalp, so your head stays closer to a comfortable temperature while the rest of you sweats.
The same wool also absorbs a little sweat and helps regulate temperature, much as wool clothing does. The net effect is that your head does not overheat as fast, which is what lets experienced sauna-goers sit through the hottest rounds without discomfort.
Wool or felt: what is the difference?
It is a bit of a trick question, because the classic sauna hat is both: it is made of wool felt. When people say felt hat they almost always mean one pressed from sheep or merino wool, and that is the material you want for a traditional dry sauna. Pure wool handles high, dry heat well and insulates better than thinner fabrics.
You will occasionally see cotton or linen sauna caps too. These suit humid steam rooms and hammams better than a bone-dry sauna, and they insulate far less. For a UK beach or barrel sauna, a thick 100 percent wool felt hat is the right choice.
How do you wash and care for a sauna hat?
Hand wash only, in cool water
Use cool water and a little mild wool detergent. Hot water and agitation make wool felt shrink and matt further.
Do not machine wash or tumble dry
Both will shrink and misshape a wool felt hat, sometimes ruining it. Never wring it hard either.
Reshape while damp
Gently press it back into shape and let it dry flat or over a rounded object so it keeps its form.
Air dry fully between sessions
A damp hat can smell and degrade. Hang it to dry after each sauna rather than leaving it bunched in a bag.
Store dry
Keep it somewhere airy. Many hats have a loop so you can hang them up at home and at the sauna.
What should you look for when buying a sauna hat?
100 percent wool felt. Avoid synthetic blends, which insulate less and can smell in the heat.
Decent thickness. A thicker felt insulates better and lasts longer than a thin, floppy one.
A comfortable fit. It should sit over your ears without being tight. Many are one-size and mould to your head over time.
A hanging loop. A small loop makes drying and storing far easier and is a sign of a properly made hat.
Simple, undyed or naturally dyed felt. Heavy dyes can occasionally run when wet; natural wool tones avoid that.
Where can you buy a sauna hat in the UK?
Sauna hats are easy to find in the UK now that the scene has grown. Many beach and community saunas sell their own branded wool felt hats on site or through their websites, which is a good way to support the operator you visit. Dedicated sauna and wellness retailers stock them too, as do the larger online marketplaces.
Because a good wool felt hat lasts for years, it is worth paying a little more for genuine thick wool rather than a cheap thin cap. If you are building a kit, a hat pairs naturally with the other essentials in our sauna accessories guide, and our what to wear in a sauna guide covers the rest.
