Reflectix 24 in. W X 10 ft. L R-3.7 to R-21 Reflective Radiant Barrier Insulation Roll 20 sq ft

24 inch x 10 feet, square edge roll double bubble foil both sides, reflective insulation, 5/16 inch thick with two outer layers of aluminum foil, each foil layer is bonded to a tough layer of polyethylene for strength, reflects up to 97 percent of radiant.