Far Infrared rays has the deep penetrating ability ability to penetrate, refract, radiate and reflect.FIR Can be absorbed.FIR transforms from light energy into heat energy. The thermal effect within the deep layers of the tissues causes blo od vessels and capillaries to dilate, promoting better bl ood circulation, and the heat helps get rid of body toxins and metabolic., do not keep high teamperature work for so long.use it should be at a spacious place