Infrared is radiant heat. It is the same feeling of warmth as the winter sun on your face and the heat from a coal fire. It is even the same form of heat emitted by your own body. It is the most basic form of heating known to man. Infrared is the direct transfer of heat from the heater to the object (you and the room around you) without heating the air in between. It’s the same heat we feel from an environment warmed by the sun, and the wavelength most efficiently absorbed by the body. It is 100% safe and natural (it’s UV from the sun that is harmful, not infrared).