A typical sauna experience is kind of like sitting in an oven preheated to 185oF. The infrared version is better: It’s like sitting in a microwave. The low-intensity radiation warms you from the inside out, penetrating about 3 to 4 centimeters below your skin while the room temperature reaches a balmy 140o. Despite what you may have heard, infrared saunas are not dangerous.
More like soothing. They boost your metabolism and can help stimulate healing and regeneration on a cellular level, says Michael Hamblin, Ph.D., a researcher at the Wellman Center for Photomedicine at Massachusetts General Hospital. Basically, the rays warm you a few centimeters deeper than a traditional sauna does. Use of infrared saunas can enhance cardiac function and improve mood, research shows.