RadiantGUARD DOUBLE Bubble Aluminum Reflective Insulation Roll 48-inch by 125 linear feet (500square feet) Bubble Insulation Metal Building Vapor Barrier - BLOCKs 94% of Heat, Reduces Condensation 500 square foot with two layers of bubble between two layers of reflective film. Reflects 94% of radiant heat. Does not compress, collapse or disintegrate. Nominal Thickness: 5/16". Size: 48" wide and 125 feet long for a total of 500 sf. Lowers heating and cooling costs year round and made in the USA.