Introduction: What You Wear Matters More Than You Think
Choosing the right clothing for a sauna or cold plunge session is not about style, it is about safety, comfort, and getting the most out of your time. The wrong fabric can trap heat against your skin, metal accessories can burn, and cotton in cold water can drop your core temperature faster than you want.
At Plunsana in St. Petersburg, FL, we see first-time visitors navigate these choices every week. This guide covers what works, what to avoid, and what to bring so you can focus on the experience instead of your outfit.
General Principles for Thermal Therapy Attire
Regardless of whether you are heading into heat or cold, a few principles apply across the board:
- Function over fashion. Your clothing needs to perform under extreme temperature conditions. Choose based on material and fit, not appearance.
- Breathable and quick-drying. Fabrics that wick moisture and dry fast are ideal. They regulate temperature and prevent prolonged skin contact with wet material.
- Non-metallic. Zippers, clasps, underwire, and metal rivets absorb heat rapidly in a sauna and can cause burns. In a cold plunge, metal conducts cold directly to the skin and creates uncomfortable pressure points. Remove all metal accessories before entering either environment.
- Avoid synthetic fabrics in heat. Polyester, nylon, and spandex-heavy blends trap heat against the skin and can become uncomfortably hot in a sauna environment. Some synthetics can even release volatile compounds at high temperatures. The Cleveland Clinic specifically warns against wearing synthetic materials in saunas.
- Cotton is poor for cold water. Cotton absorbs and holds water, losing all insulating properties. In a cold plunge at 39-51 degrees F, soaked cotton fabric pulls heat away from your body faster than bare skin would, which is counterproductive to a controlled cold exposure.
What to Wear in a Sauna
Best Options
- Towel only. The simplest and most traditional option. A clean cotton towel wrapped around the body allows maximum airflow and sweat evaporation. Most experienced sauna users prefer this approach.
- Cotton T-shirt and shorts. Lightweight, loose-fitting cotton allows the skin to breathe while providing coverage. Choose light colors, which absorb less radiant heat than dark ones.
- Sauna wraps and robes. Cotton or linen wraps designed for sauna use are available and provide comfortable coverage without trapping heat. These are especially popular in co-ed settings.
What to Avoid
- Polyester, nylon, or spandex-dominant clothing. These fabrics trap heat, restrict evaporation, and can become unpleasantly hot against the skin at 185-195 degrees F.
- Swimwear with metal hardware. Clasps, zippers, hooks, and underwire can heat to the point of burning skin. If your swimwear has any metal components, leave it in the locker.
- Footwear inside the sauna. Rubber soles can melt or off-gas at high temperatures. Go barefoot or wear a clean towel under your feet.
Tips by Gender
Women: Cotton wraps, sports bras without underwire, or loose cotton tank tops and shorts are all good options. Avoid anything with clasps, hooks, or metallic elements. If wearing a sports bra, choose one made from cotton or a cotton-blend that breathes in heat.
Men: A cotton towel wrapped at the waist or loose cotton shorts are the most common choices. Compression shorts are also acceptable as long as they are not heavily synthetic. Skip the gym shorts with metal grommets or drawstring tips.
Plunsana Recommendations
Our saunas operate at 185-195 degrees F. At these temperatures, most guests prefer a towel or moisture-wicking shorts with minimal coverage. Whatever you choose, sit on a towel for hygiene and comfort, the bench surface is hot.
What to Wear in a Cold Plunge
Best Options
- Simple swimwear. A basic swimsuit or swim trunks made from quick-drying material is ideal. Secure fit matters, you do not want to adjust clothing while focused on managing your breath and cold response.
- Compression shorts or athletic briefs. Synthetic compression gear works well in cold water (unlike in heat). The snug fit keeps the garment in place, and the material does not absorb water the way cotton does.
- Neoprene booties and gloves (optional). Extremities cool fastest. If you are doing longer plunges or are sensitive to cold in your hands and feet, thin neoprene gloves and booties can extend your tolerance without reducing the core benefits of cold exposure.
- Warm hat (optional). A significant amount of heat escapes through the head. Wearing a beanie or warm hat during a cold plunge can help maintain core temperature during longer immersions.
What to Avoid
- Cotton anything. Cotton absorbs water and holds it against your skin, accelerating heat loss in a way that works against controlled cold exposure. It also takes far longer to dry afterward.
- Loose trunks or baggy shorts. Loose clothing traps cold water against the body and creates drag. It also tends to float or shift, creating distraction when you need to stay focused and still.
- Nothing at all. At Plunsana, swimwear is required in all shared spaces, including cold plunges.
Plunsana Tips
Our cold plunges run at 39-51 degrees F. Simple, secure swimwear is the standard. Most guests wear swim trunks or a one-piece suit. If you are new to cold plunging, do not overthink the clothing, focus on your breathing and the duration of your immersion.
Hygiene and Etiquette Tips
- Rinse off before entering the sauna or plunge. A quick shower removes lotions, deodorants, and surface oils that can contaminate shared water and affect air quality in the sauna.
- Sit on a towel in the sauna. This is standard practice for hygiene and comfort. Bring your own or use one provided.
- Remove makeup and jewelry. Makeup clogs pores under heat, defeating one of the skin benefits of sauna use. Jewelry, especially metal, conducts heat and can burn or become uncomfortable.
- Wear flip-flops or slides in common areas. Keep footwear for the walkways and changing areas, but remove them before entering the sauna or plunge.
- Skip perfume, cologne, and heavily scented products. In an enclosed, high-heat environment, fragrances become amplified and can be overwhelming or irritating to others.
What to Bring
- Two towels. One for sitting on in the sauna, one for drying off after. If you plan to do multiple rounds of contrast therapy, you may want a third.
- Clean swimwear. Bring what you will wear in the plunge and sauna, plus a dry set if you prefer to change between modalities.
- Water bottle. Hydration is non-negotiable. Bring a bottle you can refill and keep it accessible between rounds.
- Slides or flip-flops. For walking between areas. Remove before entering the sauna or plunge.
- Comfortable clothes for after. You will want something loose, dry, and comfortable to change into before heading home.
- Hair tie. If you have longer hair, tie it back before entering the sauna or plunge. Loose hair can get in the way and traps heat uncomfortably against the neck.
What to Wear After Your Session
After a contrast therapy session, your body is in recovery mode. Your circulatory system has been through significant expansion and constriction, your nervous system is shifting toward parasympathetic dominance, and your core temperature is recalibrating. What you wear matters here too:
- Dry, cozy layers. Your body will continue to cool for 20-30 minutes after your last round. Comfortable, breathable layers help your body regulate without overcorrecting.
- Hydrate with electrolytes. This is not clothing advice, but it belongs here: you have lost significant fluid and minerals through sweat. Water alone may not be enough. Add electrolytes or a pinch of salt to your post-session drink.
- Breathable clothing. Avoid tight, restrictive clothing immediately after a session. Your body is still regulating, give it room to do so.
- Plastic bag for wet gear. A simple zip-lock or waterproof bag for your wet swimwear and towels keeps your bag and car dry on the way home.
Special Situations and FAQs
What is the nude policy?
Plunsana is a swimwear-required facility. All guests must wear appropriate swimwear or a towel in shared spaces at all times.
Can I use the sauna or cold plunge while menstruating?
Yes. A tampon, menstrual cup, or period swimwear is recommended for cold plunge sessions. Sauna use during menstruation is generally safe and may help with cramp relief, though you should stay well-hydrated and listen to your body.
Can I wear jewelry?
It is strongly recommended that you remove all jewelry before entering the sauna. Metal heats rapidly at 185-195 degrees F and can cause burns. In the cold plunge, metal conducts cold and can be uncomfortable. Leave jewelry in your locker.
What about kids or teens?
Minors should wear appropriate swimwear at all times and must be accompanied by an adult. Shorter sauna sessions at lower temperatures are recommended for younger guests. Cold plunge access for minors should be discussed with staff beforehand.
Should I apply sunscreen before a sauna?
No. Sunscreen, like other topical products, can clog pores under heat and reduce the skin benefits of sauna use. If you are using the outdoor sauna during peak sun hours, apply sunscreen after your session, not before.
What if I forgot my gear?
Plunsana has towels available. If you forgot swimwear, check with the front desk about available options. It is always best to come prepared, but the team can help you figure it out.
Final Tips on Comfort and Performance
- Stay hydrated. This bears repeating. Drink water before, during, and after your session. Dehydration impairs the body's ability to thermoregulate and reduces the benefits of both heat and cold exposure.
- Eat light. A heavy meal within 60-90 minutes of a session can cause nausea in the sauna and discomfort in the cold plunge. Eat something light and easily digestible if you need fuel beforehand.
- Use breathwork. Controlled breathing is the most important tool you have in both the sauna and the cold plunge. Focus on slow, deep nasal breathing to stay calm and extend your sessions productively.
- Cooling towel. A damp towel draped around the neck between sauna rounds can help manage overheating and extend total session time.
Conclusion: Dress Smart, Chill Hard
The right clothing will not make or break your wellness practice, but it will remove friction. When you are not thinking about what you are wearing, because it is comfortable, safe, and appropriate for the environment, you can focus entirely on the experience: the heat, the cold, the breath, and the recovery.
Keep it simple. Natural fabrics in the sauna, quick-drying swimwear in the plunge, and comfortable layers for after. Remove metal, skip the fragrances, and bring a towel you do not mind sweating through.
If you are planning your first visit to Plunsana, schedule a tour to see the space and get oriented before your first session. Or book your visit and come ready to sweat.