Low-voltage operation means the greatest efficiency in producing Far Infrared Radiant heat, and it is safe even from accidental contact with fingernails or water. The Fir Thermal Heating Beauty Bed Sheet has solid, one-piece construction, of nylon and space carbon fiber. Its size ensures ample coverage and a comfortable fit for anybody. The improved digital controls are operated by a microprocessor, housed in a sturdy, stand-alone control box.