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Your head sits closest to the ceiling, where the air is hottest. A barrier of still wool slows heat absorption — so you stay comfortable, and stay in longer.
4mm of 100% Australian merino wool felt, tailored from heavy-duty sheets into a dense heat shield. Naturally temperature-regulating, moisture-wicking, and antimicrobial — softens and molds to your head over the first few sessions.
Wool creates a barrier of still air that slows heat absorption at the scalp, so your head stays comfortable through a full round instead of telling you to leave.
Sit out the session your body actually needs. The hat lets you stay long enough for the heat to do its work, on the bench you want to sit on.
Dry heat above 80°C is hard on hair structure. The hat shields it from direct heat exposure for the duration of a session — every session.
After the first session with the hat, I sat for fifteen minutes without checking the door. I didn’t know I’d been checking the door.— Eero K., founding customer
Colour treated hair and a sauna habit don't mix. I'd been getting real dryness and breakage at the ends. Wearing this every session for two months and the difference is obvious. Doesn't smell after use either, which surprised me for wool.
Went from 12 minutes to 20 on the top bench.
I've been doing 15 minute sessions at 90°C for years and always tapped out because my head was cooking. First session with this hat I went 25 minutes without thinking about it. The felt is thick and stiff out of the box but it's already softening after a week. Worth it.
Your head absorbs more heat per square centimetre than any other part of your body. A wool felt hat changes how long you can stay — and what the heat can do for you.
Heat shock proteins, cardiovascular adaptation, and why regularity matters. The science behind the sauna ritual, grounded in two decades of Finnish cohort research.