Full-Spectrum Infrared Saunas use infrared light to heat the body directly, rather than heating the air around you like traditional saunas. This light penetrates the skin, warming your body from the inside. The 'full-spectrum' refers to the entire range of infrared wavelengths used – near, mid, and far – each offering different health benefits. The heat is gentler and more tolerable than conventional saunas, making it a comfortable experience.