How to Wash and Care for a Wool Sauna Hat

How to wash a wool sauna hat

Quick answer: To wash a wool sauna hat, hand wash it in cool water with a little mild wool detergent, press the water out without wringing, and lay it flat to dry away from heat. Skip the washing machine, hot water, and the dryer, which shrink and felt wool. Wool resists odor, so you rarely need to wash it at all.

Key takeaways

• Hand wash in cool water with a mild wool detergent. Hot water and machine agitation are what shrink and felt wool.
• Do not wring or twist the hat. Press the water out gently, then reshape it.
• Lay it flat to dry away from direct heat and sun. Never tumble dry or hang a soaking-wet wool hat.
• Wash rarely, only when it needs it. Wool naturally resists odor, so airing the hat out between sessions is usually enough.
• Wear it dry, let it dry fully after each session, then store it on its hanging loop so it keeps its shape.
• Done this way, one wool hat holds its shape and softness for years.

A wool sauna hat is about the lowest-maintenance thing in your sauna kit. It does not need frequent washing, special products, or dry cleaning. The only real way to ruin one is to treat it like a regular laundry item, so the whole of hat care comes down to washing it gently and rarely, and drying it flat.

How to wash a wool sauna hat

Wash a wool sauna hat by hand in cool water. The whole job takes a few minutes and you will rarely need to do it. The steps:

• Fill a basin with cool water and a small amount of mild wool detergent. Cool, not hot, is the part that matters most.
• Submerge the hat and gently press the soapy water through it. Do not scrub, twist, or rub, which is what mats the fibers.
• Soak briefly if it needs it, up to about 30 minutes for a dirty hat, then drain.
• Rinse in cool water until the soap is gone.
• Press the water out, do not wring. Squeeze gently, or roll the hat in a clean towel to blot the moisture.
• Reshape it and lay it flat to dry.

That is the entire routine. No special equipment, no dry cleaning.

Why you should not machine wash or tumble dry a wool sauna hat

Machine washing and the dryer are what ruin wool hats, because heat and agitation are exactly what turn wool into felt. Wool fibers are covered in tiny scales. Hot water opens those scales, and agitation rubs them together until they lock, shrinking the hat into a smaller, denser, misshapen version of itself. That process is called felting, and it does not reverse.

So the rules are simple:

• No hot water. It opens the fiber scales so they can mat together.
• No machine agitation or spin. The rubbing locks the scales. If you absolutely must use a machine, a wool or delicate cycle in cold water inside a mesh bag is the only halfway-safe option, and hand washing is still safer.
• No dryer. Heat plus tumbling is the fastest way to shrink a wool hat.
• Skip enzyme detergents and bleach. Enzymes and harsh cleaners attack the wool protein. A mild wool wash is all you need.

How do you dry a sauna hat?

Dry a wool sauna hat flat, in its natural shape, away from heat. After pressing out the water, set it on a clean towel or a drying rack and reshape the crown and brim while it is still damp so it dries to the right form. Keep it out of direct sun and away from radiators or a hot windowsill, since heat can shrink it or fade the color. Do not hang a soaking-wet wool hat, because the weight of the water can stretch it out of shape. Once it is fully dry, it is ready to store.

How often should you wash a sauna hat?

You rarely need to wash a sauna hat, because wool naturally resists odor. Wool fights the bacteria that cause smell, so a hat stays fresh far longer than a cotton or synthetic one would. For most people, airing the hat out to dry fully after each session is all the maintenance it needs. Wash it only when it actually looks dirty or picks up a smell, which for a hat worn dry is not often. Over-washing does more harm than good, since every wash is another chance to felt the wool.

How do you store a sauna hat and keep its shape?

Store a sauna hat dry, on its hanging loop, once it has fully dried after a session. Most quality hats, ours included, have a loop at the top for exactly this. Hanging it lets air move around the felt and keeps the crown from being crushed flat. A few habits keep the shape:

• Let it dry completely before storing. Putting a damp hat away invites musty smells and, over time, mildew.
• Hang it rather than folding it under other gear, so the dome and brim hold their form.
• Keep it off a hot, damp pile. A dry hook or shelf near the sauna is ideal.

How to wear a sauna hat so it lasts

Wear a sauna hat dry, every time. This is the one habit that protects both the hat and its job. Dry wool traps a layer of insulating air that keeps heat off your scalp, so a dry hat works better and lasts longer. Wetting or soaking it removes that insulating layer, makes the hat conduct heat toward your head, and speeds up wear on the felt. Put the hat on before you go in, wear it through the session, and let it stay dry. A little sweat or the odd drip is fine, just let it dry fully afterward. Keep the hat off the hot stones and heater, where a stray touch can scorch the wool.

What we use, and why

We make the Havu line of wool sauna hats to be this low maintenance on purpose. Four styles, all real wool, a 100% merino wool hat, a 100% wool classic sauna hat, a 100% wool bucket hat, and a 93% merino beanie, each with a hanging loop so it dries and stores cleanly. The care is the simple cool hand wash above, and that is all a good wool hat asks for. For everything else about sauna hats, see our complete guide.

Buyers tell us the material holds up. As one put it, the hat is "very soft and not itchy like some wool products," and it keeps its softness and shape over time: "Really love this quality well made sauna hat."

See the Havu sauna hats →

Frequently asked questions

How do you wash a wool sauna hat?

Hand wash it in cool water with a little mild wool detergent, gently pressing the water through rather than scrubbing. Rinse in cool water, press the water out without wringing, reshape it, and lay it flat to dry. The whole job takes a few minutes.

Can you machine wash a sauna hat?

Better not to. Machine agitation and heat felt and shrink wool. If you have no choice, use a wool or delicate cycle in cold water with the hat in a mesh bag, but hand washing is safer and just as quick. Never tumble dry it.

How do you dry a sauna hat?

Lay it flat in its natural shape on a clean towel or drying rack, away from direct heat and sun. Reshape the crown and brim while it is damp. Do not hang a soaking-wet wool hat, since the water weight can stretch it, and never use a dryer.

How often should you wash a sauna hat?

Rarely. Wool naturally resists odor, so airing the hat out to dry after each session is usually enough. Wash it only when it looks dirty or picks up a smell. Over-washing risks felting the wool, so less is genuinely more here.

What detergent should you use on a wool sauna hat?

A mild, wool-specific detergent, used sparingly. Avoid regular enzyme detergents and bleach, which attack the wool protein and can damage the fibers. A small amount of gentle wool wash in cool water is all a sauna hat needs.

Does a wool sauna hat shrink?

It can, if you wash it in hot water, machine agitate it, or tumble dry it. Heat opens the fiber scales and agitation locks them together, which shrinks and felts the wool for good. Washed cool by hand and dried flat, it keeps its size and shape.

How do you get the smell out of a sauna hat?

Usually just air it out. Wool resists odor on its own, so drying the hat fully after each session keeps it fresh. If it does hold a smell, a cool hand wash with a little wool detergent and a flat dry will clear it. Skip fabric softener and heavy fragrances.

How do you store a sauna hat?

Dry, on its hanging loop, once it has fully dried after a session. Hang it so air circulates and the crown is not crushed flat, and keep it off a damp pile. A dry hook or shelf near the sauna works well and keeps the hat in shape.

Do you wear a sauna hat wet or dry?

Dry. Dry wool traps insulating air and keeps heat off your scalp, so the hat both works better and lasts longer. Wetting it removes that layer, makes the hat conduct heat toward your head, and wears the felt faster. Let it dry fully after each session.

How do you keep a sauna hat from losing its shape?

Wash it cool and rarely, press out water instead of wringing, reshape it while damp, and dry it flat. Then hang it by its loop to store, rather than folding it under other gear. Heat and wringing are what distort the shape, so avoid both.