Quick answer
A merino wool sauna hat is made from felted merino sheep's wool, a fine, soft fibre that insulates well and breathes. Pressed into a thick felt, merino keeps the hottest sauna air off your head while staying comfortable as you sweat. CALOR is made from 100% New Zealand merino, felted to around 3mm.
Why merino works in the sauna
- Insulation: merino's natural crimp traps air, and trapped air slows heat transfer.
- Breathability: wool lets moisture and heat move, so it doesn't feel sealed in.
- Moisture handling: wool can absorb moisture and still feel comfortable.
- Softness: fine merino fibres make a smoother, softer felt than coarse wool.
Merino vs regular wool vs synthetics
| Merino felt | Regular wool felt | Synthetic | |
|---|---|---|---|
| Feel | Soft, dense | Firmer, coarser | Can feel hot |
| Insulation | High | High | Varies |
| Breathability | High | High | Low |
| Natural | Yes | Yes | No |
CALOR Merino Sauna Hat
3mm New Zealand merino, hand-felted
Shields your head and hair from the hottest air in the sauna. One size, four colours. Bundle 2–4 hats and save up to 20%.
From New Zealand to your sauna
New Zealand is one of the world's best-known homes of merino wool. CALOR uses 100% New Zealand merino, felted thick and finished by hand, then shaped into a soft bucket hat.
Caring for merino felt
Hang it to air between sessions, rinse every few sessions in cool water, reshape and air dry. Avoid washing machines, dryers and hot water, which can shrink felt.
Frequently asked questions
Is merino wool good for a sauna hat?
Yes. Merino insulates, breathes and handles moisture, and its fine fibres make a soft, comfortable felt.
Does a merino sauna hat itch?
Merino's fine fibres feel softer than coarse wool, which is why many people find it more comfortable.
Is CALOR 100% merino?
Yes. CALOR is made from 100% New Zealand merino wool felt, approximately 3mm thick.
Keep reading
Four colours. One ritual.
One for you.
One for the bench.
The more hats in your set, the less each one costs. Mix colours for partners, friends or the whole sauna crew. Free shipping on 2 or more.