Using an infrared sauna blanket is straightforward: you preheat it, lay inside wearing loose clothing or a towel, and let the far infrared heat do its work for 15 to 45 minutes. But getting the details right, from temperature settings to hydration, makes the difference between a great session and an uncomfortable one. Here’s everything you need to know to use yours safely and effectively.
How Infrared Sauna Blankets Work
Most sauna blankets use far infrared light, which operates on longer wavelengths that penetrate up to 1.5 inches below the skin’s surface. Unlike a traditional sauna that heats the air around you, far infrared energy heats your body directly. This raises your core temperature, triggers sweating, and increases blood flow without the suffocating feeling of sitting in a 180°F room. The blanket itself typically reaches between 86°F and 158°F, which feels intense when the heat is wrapped around your body rather than floating in open air.
Setting Up Before Your Session
Lay the blanket flat on a heat-safe surface. A bed works fine, though some people prefer the floor with a yoga mat underneath for extra insulation. Avoid placing it directly on delicate wood furniture or surfaces that could be damaged by prolonged warmth.
Place a cotton towel insert (most blankets include one) inside the blanket. This layer absorbs sweat and keeps the interior clean. Then plug in and preheat the blanket for at least 15 minutes at your desired temperature before climbing in. Skipping the preheat means you’ll spend the first chunk of your session waiting for it to warm up, which cuts into your effective time.
What to Wear Inside the Blanket
Loose, breathable clothing is the standard recommendation. Long sleeves and pants made of cotton give you a comfortable barrier between your skin and the heated surface. Remove all jewelry, watches, and anything metallic or magnetic before getting in, as metal conducts heat and can cause burns.
You can also use the blanket without clothing as long as the towel insert is in place. Some people find direct skin contact intensifies the heat, so if you go this route, consider starting at a lower temperature.
Temperature and Duration for Beginners
Start your first session at a low to moderate temperature (around 100°F to 120°F) for just 15 minutes. This lets you gauge how your body responds before pushing further. Experienced users typically work up to 30 to 45 minutes at higher settings, but there’s no benefit to rushing the process. Most blankets offer adjustable timers up to 60 minutes and will automatically shut off if internal temperatures exceed safe levels.
Your body acclimates over several sessions. After three or four uses, you’ll have a much better sense of what temperature and duration feel right. If you feel dizzy, nauseous, or uncomfortably hot at any point, end the session. That’s your body telling you you’ve hit your limit for the day.
Hydration Is Non-Negotiable
Infrared heat triggers significant sweating, and dehydration can set in faster than most people expect. Fluid loss affects your body’s ability to regulate temperature, increasing the risk of heat exhaustion. Drink at least a full glass of water 15 to 30 minutes before your session, keep water within arm’s reach during the session, and drink steadily afterward.
Your blood plasma levels typically return to normal within 30 to 60 minutes of finishing a session, provided you rehydrate adequately. Adding an electrolyte drink or a pinch of salt to your post-session water helps replace what you lose through sweat, especially if your sessions run longer than 20 minutes. People with individual differences in heat tolerance, whether from physical condition, medications, or electrolyte balance, are more susceptible to heat stress and should be especially attentive to fluid intake.
How Often to Use It
Two to three sessions per week is enough to experience consistent benefits. Daily use is generally safe for healthy individuals who have built up tolerance, but more frequent doesn’t necessarily mean better. Give your body at least a few hours to fully rehydrate and cool down between sessions if you plan to use it on consecutive days.
Cleaning Your Blanket After Each Use
Sweat, body oils, and bacteria accumulate quickly inside a heated blanket, so wipe it down after every session. Open the blanket fully, lay it flat with the interior surfaces facing up, and use a soft damp cloth or antibacterial wipe to clean all the areas that touched your skin. For stubborn spots, a small amount of mild soap mixed with water works well. Wring out excess liquid thoroughly before wiping, because pooled water can damage the heating elements.
Avoid bleach, alcohol, abrasive cleaners, or any harsh chemical detergents. These can break down the blanket’s surface material permanently. After wiping, let the blanket air dry completely before folding or rolling it for storage.
Who Should Avoid Infrared Sauna Blankets
The heat is intense enough that several health conditions make sauna blanket use risky or outright unsafe:
- Cardiovascular conditions: High or low blood pressure, congestive heart failure, and impaired circulation can all be worsened by prolonged heat exposure, particularly if you take medications that affect blood pressure.
- Pregnancy: Elevated core body temperature can cause fetal harm. Pregnant women should get medical clearance before using any type of sauna.
- Active infections: Enclosed infections in teeth, joints, or other tissues are a strict contraindication. Vigorous heating can worsen these conditions.
- Acute joint injuries: Any joint that is freshly injured, hot, or swollen should not be heated for at least 48 hours or until inflammation subsides.
- Impaired sweating: Conditions like multiple sclerosis, central nervous system tumors, and diabetes with neuropathy can impair the body’s ability to sweat and regulate heat. Sauna use should be avoided entirely.
- Fever or alcohol intoxication: Both compromise your body’s heat regulation and judgment. Never use a sauna blanket to “sweat out” a hangover; alcohol already elevates heart rate, and adding heat stress compounds the risk.
- Bleeding disorders or metal implants: Anyone predisposed to bleeding should avoid use, and anyone with implants should stop immediately if they feel pain near the implant site.
Checking for Low EMF Output
Sauna blankets contain heating elements that produce electromagnetic fields. The generally accepted safe range is 0 to 2 milligauss (mG). When shopping, look for blankets that list their EMF output specifically, and check for an electrical safety certification from a recognized testing organization. Some blankets on the market emit as low as 0.16 mG, so low-EMF options do exist if this is a concern for you.
A Typical Session, Start to Finish
Here’s what a complete session looks like in practice. Drink a glass of water. Lay the blanket out, insert your towel, and start preheating at your chosen temperature. Use the 15-minute preheat window to change into loose cotton clothing and remove any jewelry. Climb in, zip or velcro the blanket closed (leaving your head and arms free on most models), set your timer, and relax. Many people listen to music, meditate, or simply close their eyes.
When the timer goes off, unzip the blanket slowly and sit up gradually. You may feel lightheaded from the heat and fluid loss, so take a moment before standing. Drink water immediately. Wait 10 to 15 minutes before showering to let your body cool down naturally, then clean the blanket interior while it’s still accessible. The whole process, from preheat to cleanup, takes about 45 minutes to an hour for a 30-minute session.