RadiantGUARD SINGLE Bubble Reflective Aluminum Insulation 48-inch by 125 linear feet (500 square feet)  Pack Metal Building Vapor Barrier - BLOCKs 94% Radiant Heat and Reduces Condensation Reflects 96% of radiant heat. Does not compress, collapse or disintegrate. Nominal Thickness: 3/16". 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.