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the human body can absorb fir because of its deep penetrating ability. when fir penetrates through skin to the subcutaneous tissues. far infrared rays has the ability of penetration, refraction, radiation and reflection. the human body can absorb fir because of its deep penetrating ability. when fir penetrates through skin to the subcutaneous tissues, it transforms from light energy into heat energy. the thermal effect within the deep layers of the tissues causes blood vessels and capillaries to dilate, promoting a better blood circulation, and the producing heat helps to get rid of body toxins and metabolic wastes through sweating..syi