One layer closed-cell foam bonded between two layers (1 layer of highly reflective metalized aluminum polyester film and 1 layer of durable textured white vinyl facing). 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 Saves energy by reducing the stress on heating and cooling systems, keeping your home warmer in the winter, and cooler in the summer. It can reduce utility bills substantially all year round. As well as provides benefits of soundproofing when used in walls, ceilings and floors. Can also increase your overall property value depe.