Single Bubble Insulation - White/Foil - 4' X 125' (500 sq ft) Single Bubble Foil / White Insulation - 500 square foot roll (4' X 125') 96% Reflectivity, 0.04% Emissivity, 100% vapor barrier Lowers heating & cooling costs; Improves HVAC system performance High tear resistance Installs quickly and easily with a tape measure, scissors, and staples (DIY)