New, innovative underwear Thermodynamic properties Regulates body heat and guarantees perfect protection against the cold. Fire Skin fibers contain graphite, which generates infrared heat when in direct contact with the skin. Antibacterial, anti-odor, anti-static and chemical free Fire Skin retains its properties wash after wash due to the use of special fibers and not just a coating.F307 Suitable as an undersuit under wet and dry suits