Reflectix BP24050 24-Inch-by-50-Foot Bubble Pack Insulation. The Reflectix Double Reflective Insulation is the most versatile, widely-distributed, energy-efficient product that we manufacture. The characteristics that make it so attractive include ease-of-handling and installation, more than 40+ commercial and residential construction applications, and a large selection of product configurations to accommodate the vast majority of applications / buildings.
From the Manufacturer
Metallic foil surface repels heat; air bubble lining resist transfer of heat.