RadiantGUARD DOUBLE Bubble White Concrete Insulation Roll Reflective Aluminum Bubble Insulation Metal Building Vapor Barrier 48-inch by 125 linear feet (500 square feet) - BLOCKs 94% Radiant Heat TWO bubble layers between one layer of white poly and one layer of reflective film Reflective insulation vapor barrier for concrete flooring and inside concrete slabs 500 SQUARE FEET: 48 inches by 125 linear feet roll Nominal Thickness: 5/16 of an inch Lowers heating and cooling costs year round and made in the USA