Infrared rays are perceived by the human body in the form of heat but they are not visible to the naked eye. Unlike the classic Finnish sauna, which works by heating the air inside the cabin, infrared lamps heat the body penetrating directly under the skin, in the tissues. This way, they activate the expulsion of impurities through sweating. They also allow muscle relaxation and increase blood circulation. The depth of penetration depends on the wavelength of the IR rays.
