What to Wear in a Sauna: A Simple Guide

Nobody tells you this before your first sauna, so most people guess. They walk in wrapped in a hotel towel, or in gym shorts that turn heavy and cold within minutes, and they spend the whole session slightly uncomfortable.

Sauna attire is not complicated, but the rules change depending on where you are, and the fabric matters more than the garment. Here is what actually works.

The short answer

In a private or home sauna, most people wear nothing, or a towel. In a public or gym sauna, wear a swimsuit or loose natural fibre clothing. In a spa, follow the house rule, which is usually a robe on the way in and a towel to sit on.

Whatever you wear, it should be loose, light and made from a fibre that breathes. That single rule matters more than the shape of the garment.

What to wear in a public sauna

A swimsuit is the safe default. It is expected almost everywhere, it dries fast, and you can move between the sauna, the shower and a pool without changing.

The catch is that most swimwear is nylon or polyester. Synthetic fabric traps heat against your skin rather than letting it move, and it holds smell after repeated heat exposure. If you use a sauna often, a cotton bathing suit is more comfortable in the heat, though it does take longer to dry.

Bring a towel to sit on. This is not optional in most public saunas, and it is basic courtesy everywhere else.

What to wear in a gym sauna

Gym saunas are usually drier and hotter than spa saunas, and you are often coming straight off the floor. Do not sit in the clothes you just trained in. Sweat-soaked synthetic activewear in a hot room is unpleasant for you and for everyone else.

Change into loose cotton shorts and a light top, or a swimsuit. Leave compression wear, leggings and anything tight outside. Tight clothing in a sauna does the opposite of what you want, which is to let heat and sweat move freely.

Do you wear clothes in a sauna at a spa?

At a spa, the answer is usually a robe. You arrive in it, you take it off or open it in the sauna, and you put it back on for the walk to the cold plunge or the relaxation room.

This is where a sauna robe earns its place. A heavy terry bathrobe is fine for a bathroom, but it is far too warm for a spa circuit. A lighter cotton sauna robe, cut loose, gives you cover without adding heat, and it dries between rounds instead of staying damp.

Some spas are clothing optional in the sauna itself and clothed everywhere else. If you are unsure, ask at reception. Nobody minds the question.

The fabric rule that matters most

Heat and fabric interact in a way that most clothing labels never mention.

Natural fibres such as cotton and bamboo lyocell let air and moisture move through them. They pull sweat off your skin and pass it into the air. That is why they feel cool even when you are not.

Synthetics do the opposite. Polyester, nylon and elastane sit against your skin and hold the moisture there. In a 90 degree room this is the difference between a session that feels clean and one that feels stifling.

There is also a smell problem. Synthetic fibre holds bacteria in a way natural fibre does not, and repeated heat cycles make it worse. If your gym clothes smell after one wash, this is why. We wrote more about how the two fabrics behave in heat in bamboo vs cotton for activewear.

What not to wear

• Anything tight. Compression wear, shapewear and tight leggings trap heat and restrict circulation in a room designed to do the opposite.
• Sweat suits and plastic wraps. Marketed for weight loss, these are dangerous in a sauna. They stop your body from cooling itself.
• Metal jewellery. It heats faster than your skin and can burn you. Take off rings, chains and piercings you can remove.
• Makeup. Your pores open in the heat. Go in with a clean face.
• Contact lenses. Dry heat and lenses are a bad combination. Wear glasses or nothing.

Do you wear shoes or socks in a sauna?

Not inside the sauna itself. Bare feet are normal and correct once you are on the bench.

Flip flops or sandals for the walk between rooms are a good idea in any shared facility, for the same reason you would wear them in a communal shower. Leave them at the door.

Socks are the one item people get wrong. Cotton socks in a sauna get damp and stay damp, and they keep your feet warmer than the rest of you. Skip them.

A simple kit that covers every situation

If you use a sauna regularly, three items handle almost everything:

• A loose robe or wrap cardigan in cotton or bamboo lyocell, for arriving, leaving and moving between rooms.
• A natural fibre swimsuit for public and gym saunas where clothing is required.
• A towel to sit on, separate from the one you dry off with.

That is the whole list. Everything else is preference.

What we make for the sauna

Our spa and sauna wear is cut loose from cotton and bamboo lyocell, sewn by hand in small runs in Bali. The wrap cardigan is the piece most people start with, because it works as a sauna robe, a beach cover up and something to throw on after a class.

We use natural fibre because it is what we would want to sit in ourselves at 90 degrees. Nothing about it is technical. It is just fabric that behaves properly in heat.

If you are curious why we avoid synthetics even in swimwear, where almost every brand uses them, we explained our reasoning in why we use the fabric most brands avoid.