Thermo-Tec 14110 48" X 48" Cool-It Mat The Cool-It Mat is composed of resin-bonded silica blanketing insulation sandwiched between a mylar facing on one side and a foil facing on the other The highly-reflective mylar reflects heat away from surfaces while the foil side is orientated away from the heat source to conduct any penetrating heat across its surface thus providing the ultimate in heat protection The silica blanketing is a duel-density composite and is the main sound insulator; it is easy to trim and can be applied with the push-in fasteners provided or any weather strip adhesive