Ever seen a satellite wrapped in polar fleece? Not likely. NASA utilizes pure metals for thermal protection. Thermofeet™ utilize 99% pure aluminum applied to two sides of a polyolefin film. The result is a 98% efficient reflection of body heat. Thermofeet™ are placed under the insole, orthotic, or to the top of the insole when the insole or inner boot has been removed. Thermofeet™ have a series of pores to facilitate normal vapor transfer but are not intended for direct contact with the foot.