Design Engineering Heat Sheath is an aluminized sleeving sesigned to slide over wires, cables and hoses. Heat Sheath provides ultimate protection from extreme heat as well as chemical and oil spills, dirt, grease and road grime. Constructed from a high temperature fabric and bonded to an aluminized material to reflect heat. Heat Sheath is fireproof and withstands direct heat up to 500 degrees Fahrenheit.