The present invention relates to a mid infrared radiation sauna comprising a) a room, b) one or more elements able to emit infrared radiation； c) means for operating said elements； and d) a cover plate positioned between at least one of the elements and the open space of the room to be accessed by individuals. The cover plate is made of either i) a thermoplastic material or polymer that transmits more than 50% of incident infrared radiation in the wavelength spectrum of 6-14 microns, or ii) a plate glass that transmits more than 50% of incident infrared radiation in the wavelength spectrum of 6-14 microns.
