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Before knowing what the far infrared sauna is, we might get to know what infrared is. Infrared light to a common man is just one that emits heat to one’s body. But, the fact is that infrared light is not just any type of heat but a radiant heat that is capable of rejuvenating the blood flow of all living organisms. Infrared rays are divided into three levels: the longer wavelength is called the far infrared (FIR). The far infrared rays have more penetrating power and activate the metabolic activity in the tissues and cells. The far infrared is the safest and the most beneficial source of electromagnetic energy.