Walk into any traditional Finnish sauna and you'll spot them straight away: felt hats perched on heads, doing a job most first-time sauna-goers have never even considered. If you've only ever used a sauna bare-headed, a sauna hat can feel like an odd add-on — but it's actually one of the oldest and most practical pieces of traditional sauna kit there is. Here's what it does, and exactly how to wear one.
Why wear a sauna hat in the first place?
Traditional saunas run hot — typically 80–90°C, sometimes higher. That heat rises straight to the top of the room, which means your head and hair sit in the hottest part of the sauna the entire session. Skin can handle sustained heat far better than hair, and your scalp and hair follicles are more heat-sensitive than the rest of your body.
A sauna hat acts as insulation, keeping your head at a more comfortable, stable temperature while the rest of your body gets the full benefit of the heat. In Finland, where the tradition originated, it's standard practice for exactly this reason — not a fashion statement, a functional piece of kit.
Specifically, a good sauna hat helps with:
- Protecting hair from heat damage — prolonged high heat can dry out and damage hair, especially with repeated sessions over time
- Preventing overheating — keeping your head cooler lets you comfortably stay in the heat for longer, which matters if you're using the sauna for genuine wellness benefits rather than a quick five-minute dash
- Reducing scalp sweat dripping into your eyes — a small thing, but it makes a longer session far more comfortable
- Keeping ears more comfortable in the most intense heat near the top bench
How to wear a sauna hat: step by step
- Put it on dry, before you enter. Sauna hats work by trapping a layer of air for insulation, so they're most effective when they go on dry, before you step into the heat — not soaked in the shower first.
- Pull it down to cover your ears. Most of the benefit comes from covering the areas most exposed to rising heat — the crown of your head and your ears.
- Sit on the higher benches with confidence. Heat is always more intense higher up in a traditional sauna. A hat means you can take the top bench, where the sauna experience is strongest, without your head overheating before the rest of you has warmed up.
- Leave it on for your whole session. There's no need to take it off partway through — it's designed for continuous wear across a full traditional sauna session.
- Let it air dry between uses. Don't stuff a damp hat straight into a bag or drawer. Hang it somewhere ventilated so it dries out properly and doesn't develop odour.
What's the best material for a sauna hat?
Not all sauna hats are created equal. Material matters more here than in almost any other piece of sauna gear, because it's doing an actual thermal job, not just sitting there.
Merino wool is the gold standard, and for good reason. It's naturally insulating even when damp, breathable enough to avoid trapping excessive moisture, and far more durable under repeated heat exposure than synthetic alternatives, which can lose shape or even start to smell after a few sessions. Cheaper acrylic or polyester hats tend to compress over time and lose their insulating loft, which defeats the purpose entirely.
Our Sauna Hat in 100% Premium Merino is built specifically with this in mind — genuine Finnish sauna tradition, made from a material that actually performs under sustained heat rather than just looking the part.
Do you need a sauna hat for an infrared sauna?
Less so. Infrared saunas heat the body directly rather than heating the air in the room, and they typically run at much lower ambient temperatures (40–60°C compared to 70–90°C+ for a traditional sauna). A sauna hat is really a traditional sauna accessory, built for the higher, more intense heat that a traditional steam sauna produces. If you're using a traditional sauna regularly, though, it's genuinely one of the simplest upgrades you can make to your routine.
A small accessory, a real difference
A sauna hat won't change your sauna experience dramatically, but it removes one of the small frictions — overheated scalp, damaged hair, discomfort on the top bench — that stop people from getting the most out of a longer, proper traditional sauna session. It's cheap, it's simple, and it's been part of sauna culture for a reason.
If you're building out your traditional sauna routine, our Premium Merino Sauna Hat is a straightforward place to start.
