Real wool sauna hats. Real insulation.

Polyester felt traps heat and sweats. Felted sheep's wool breathes, insulates and shrugs off 90°C. This site is about the material your sauna hat should be made of.

Wool vs synthetic, explained How to wash one

Undyed white and grey fleece, plus dyed trims. The seven colours DIVELUX felts by hand:

GreyWhite and greyGrey, red trimWhite, blue trimGrey, blue trimWhite bucketGrey bucket

Start here

Three guides that answer the questions everyone asks first. Read them in any order.

Wool vs Synthetic Sauna Hats

Many 'wool' sauna hats are polyester felt. How to tell the difference, why it matters at 90°C, and what real wool feels like.

Read the guide

How to Wash and Care for a Wool Sauna Hat (So It Lasts Years)

Hand-washing, drying, reshaping and storing a felted wool sauna hat — a simple routine that keeps it thick, soft and fresh.

Read the guide

What '100% Natural Wool' Really Means on a Sauna Hat Label

Felted wool, lanolin, breathability, heat resistance — the properties synthetics can't fake, and how to verify a label.

Read the guide

All 37 guides

Grouped by what you are trying to figure out. New guides land three times a week.

Wool vs everything else

  1. Felted vs Knitted Wool
  2. Merino vs Coarse Wool Felt
  3. Felt
  4. Wool vs Linen Sauna Hats
  5. Recycled Wool Felt
  6. DIVELUX vs Halsa Sauna Hat
  7. Does Wool Burn? Why Wool Is the Fire-Safe Choice for the Hot Room
  8. Grey, White, Brown
  9. Boiled Wool vs Felt
  10. Is Wool Sustainable? The Environmental Case for a Felt Sauna Hat
  11. Why Wool Insulates
  12. Are Dyed Wool Sauna Hats Safe in the Heat? Dyes, Sweat and Colorfastness
  13. GOTS, RWS, Woolmark
  14. The Sheep Behind Your Sauna Hat
  15. Felt Density vs Thickness

Your hat, day to day

  1. Is a Wool Sauna Hat Itchy? What to Expect and How It Softens
  2. Your Sauna Hat Is Also a Sweatband
  3. Wool Allergy or Just Sensitive Skin? Choosing a Sauna Hat That Won't Itch
  4. The Best Wool Sauna Hats in 2026
  5. Why Your New Wool Sauna Hat Smells (and Why That's a Good Sign)
  6. How Long Does a Wool Sauna Hat Last? (And How to Double It)
  7. Wool in the Steam Room
  8. Storing a Wool Sauna Hat
  9. Did Your Wool Sauna Hat Shrink? Why Felt Shrinks and How to Rescue It
  10. Embroidered and Two-Tone Felt Hats
  11. Wet-Felting Your Own Sauna Hat
  12. Why Real Wool Sauna Hats Cost $15-30 — and 'Wool' Hats Cost $8
  13. Seams and Stitching

How felt works

  1. How Wool Sauna Hats Are Made
  2. Sauna Hat Alternatives Tested
  3. 5 Questions to Ask Before Buying a 'Wool' Sauna Hat Online
  4. Which Sauna Hat Brands Use Real Wool? A Label Audit
  5. Felt Thickness
  6. How to Tell Real Wool Felt From Fake