AstroShield White II reflective insulation is for use in agricultural and commercial buildings including metal structures. It consists of two layers of heavy-duty polyethylene air-bubble film with metalized aluminum film on one side and a white sheet for clean, streamlined, matte appearance on the other. These bubbles form trapped air spaces between the foil surfaces to give the structure excellent R-values. AstroShield is a great choice for your insulation requirements and its ability to reflect up to 94% of radiant heat also works well to enhance your current insulation assembly. AstroShield’s surfaces reflect heat in both directions, keeping you warmer in the winter and cooler in summer.