One Layer of polyethylene industrialized air bubbles bonded between two layers of highly reflective metalized aluminum/ White polyester film. Industrialized strength, lightweight yet durable insulation designed to hold staples without tearing. Does not compress, collapse or disintegrate. Reflects 97% of radiant heat, emits less than 3% of heat, Class 1 / Class A fire rated radiant barrier that has passed the ASTM E84 test & ASTM E2599. R value :7
