Reinforced Sleeve, Foil, 8 inch Dia, 5 ft Length, Thick Fiberglass Insulation Blanket, 6 R Value, 0.05 Perms Vapor Transmission, Reinforced Metallized Polyester Vapor Barrier, -20 to 250 Deg F Operating Temp., The 5 ft. Length UPC #010 Insulation Sleeves are Designed to Slip Over Standard Sheet Metal Pipe and Provide a Fast Economical Job Site Installation. The UPC #010 Pipe Sleeves are Designed for Indoor Use Only, and for HVAC Systems not Exceeding 250 deg F Operating Temperatures