Far infrared is a type of infrared energy. Far infrared is the long band wavelength of the electromagnetic spectrum, generally greater than 10 microns. Far infrared heat is believed to penetrate deeper into the fat and muscles of the body (25 - 35 mm) than topical conductive heat alone (2 - 3 mm), thereby producing greater circulation and more beneficial pain-relief effects.
Far infrared heating pads are available in a variety of sizes for home use.