"FIT Bodywrap® produces far infrared heat, which is light we can’t see, but can feel as heat. All warm blooded animals, including humans, generate this type of heat naturally to warm themselves, and more than half of the sun’s heat is infrared as well. Infrared heat warms us without warming the air around us and penetrates our bodies, rather than only heating the skin. The FIT Bodywrap generates infrared heat in the 5-15 micron wavelength, the same wavelength as the sun and our bodies produce, so it is safe and natural. Infrared as used in the FIT Bodywrap is known to help with a wide range of therapeutic benefits." - fitbodywrap.com/benefits