What to Wear in a Sauna (And What to Leave Outside)

What to Wear in a Sauna (And What to Leave Outside)

Walking into a sauna for the first time comes with one awkward question: what are you supposed to wear? The answer depends on where you are, who you're with, and what type of sauna you're using.

Let's clear it up.

The Three Main Options

Option 1: A Towel

The most universally accepted sauna attire. Wrap a cotton towel around your waist (men) or body (women), and you're good in virtually any sauna setting.

Why a towel works well:

• Cotton breathes and absorbs sweat
• It doesn't trap heat against your skin the way synthetic fabrics do
• You can unwrap and rewrap easily to adjust coverage
• It doubles as a bench cover to keep sweat off the wood

Always sit on a towel regardless of what else you're wearing. It's basic sauna hygiene and protects the bench wood from moisture damage over time.

Option 2: A Swimsuit

The standard choice in most American gyms, hotels, and public facilities. If you're in a mixed-gender public sauna in the U.S., a swimsuit is what people expect.

A few things to know:

• Choose loose-fitting cotton or linen - Tight synthetic swimwear traps heat and can feel uncomfortably hot
• Avoid swimsuits with metal hardware - Metal clasps, zippers, and underwire get scorching hot at 180°F. You will regret it.
• Skip anything with padding - Padded swimsuits retain heat and moisture, creating a sauna within a sauna that's just unpleasant

Simple board shorts and a loose cotton tank top work well. So does a basic one-piece without metal or padding.

Option 3: Nothing at All

In many cultures, this is the default. Going nude is the most effective way to sauna because nothing blocks your skin from the heat, and nothing traps moisture against your body. Your sweat evaporates freely, which is how your body regulates temperature.

Nude sauna bathing is standard in:

• Private home saunas
• Finnish public saunas (separated by gender)
• German and Austrian spas (often mixed-gender)
• Japanese onsen and sento (separated by gender)

If you have your own sauna at home, nude is honestly the way to go. No laundry, no restricted airflow, no weird tan lines. Just grab a towel to sit on.

The Sauna Hat: Not Just for Show

If you've seen photos of people wearing felt hats in a sauna and thought it looked ridiculous, fair. But there's real science behind it.

Your head is at the hottest point in the sauna (heat rises), and it's one of the most temperature-sensitive parts of your body. A sauna hat insulates your head, letting you stay in longer without the "my brain is cooking" sensation that often drives people out before their body is ready.

Traditional sauna hats are made from thick wool felt, which:

• Insulates your head from the hottest air near the ceiling
• Keeps your hair from drying out and getting brittle
• Lets you tolerate 10-15% higher temperatures comfortably
• Protects your ears, which are especially heat-sensitive

In Russia and the Baltic states, sauna hats are standard equipment, not optional accessories. Once you try one, you'll understand why.

Cultural Differences: How the World Saunas

Finland

Nudity is the norm. Saunas are typically separated by gender in public settings. Families sauna together nude at home, and it's about as scandalous as eating dinner together. Finns consider wearing a swimsuit in a sauna roughly the same way Americans would feel about wearing a coat to a pool - technically possible, but why?

Always sit on a towel. That part is non-negotiable, clothed or not.

United States

Swimsuits are expected in almost all public and gym saunas. Going nude in a mixed-gender public sauna will get you kicked out of most facilities. Single-gender settings like locker rooms are more relaxed, but practices vary.

Home saunas follow whatever rules you set. Most American home sauna owners end up going the Finnish route once they realize how much better it feels without a damp swimsuit clinging to them.

Korea (Jjimjilbang)

Korean bathhouses have a two-zone system. The bathing areas are nude and gender-separated. The communal relaxation areas (where people hang out, eat, and nap) require the provided cotton shorts and t-shirt uniform. Everyone wears the same thing - it's a great equalizer.

Germany and Austria

Nude is standard, and mixed-gender nudity is completely normal in spa settings. Wearing a swimsuit in a German sauna can actually get you asked to remove it - the concern is that synthetic fabrics release chemicals when heated and contaminate the air.

Russia (Banya)

Felt hats are essential. Birch branch bundles (venik) are used to slap the skin and promote circulation. Gender-separated. Nudity is standard, though some banyas allow towel wraps.

What NOT to Wear in a Sauna

This list matters more than the "what to wear" list:

• Jewelry - Metal conducts heat. Rings, necklaces, earrings, and watches will burn you at sauna temperatures. Take everything off.
• Synthetic workout clothes - Polyester, nylon, and spandex trap heat, don't breathe, and can release chemicals when heated. They also feel terrible.
• PVC or rubber anything - Sauna suits marketed for "extra weight loss" are dangerous. They prevent your body from cooling itself and can cause heat stroke.
• Shoes - Rubber soles can melt. Leather will crack. Flip-flops are acceptable for walking to and from the sauna but take them off inside.
• Glasses or contacts - Metal frames get hot. Contact lenses can dry out. Leave glasses outside and go by feel.
• Makeup or lotions - These clog pores when you're supposed to be sweating them clean. Plus, some products can irritate skin when heated.
• Electronics - Your phone, watch, earbuds - all of these will either overheat, malfunction, or burn you. Leave them in the changing room.

What to Bring With You

Beyond what you wear, here's a solid sauna kit:

• Two towels - One to sit on, one for drying off after
• Water bottle - Hydrate between rounds. You'll lose 1-2 pints of sweat per session.
• A sauna hat - Once you try it, you won't go back
• Flip-flops - For walking to and from the sauna, especially in public settings

SweatDecks carries everything you need in the sauna accessories collection - hats, buckets, ladles, thermometers, and more.

The Simple Rule

Wear as little as you're comfortable with, made from natural materials. Cotton and linen work. Wool felt for hats. Everything else stays outside.

At home, go nude with a towel on the bench. In public, follow the local norms. And no matter what - sit on a towel, leave the jewelry in your locker, and keep your phone far away from 180°F air.