→ One layer of polyethylene industrialized air bubbles bonded between two layers of highly reflective metalized aluminum 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 & and ASTM E2599. → Non-toxic, non-carcinogenic, fiber-free, safe to handle, and does not require protective clothing or respirators to install. Easy to install and maintenance-free, cuts easily with a utility knife or scissors, and installs easier than fiberglass. Simply staple, nail, or glue into place! No mess, and no itchy fibers! → Waterproof, Not affected by moisture or humidity. Inhibits condensation. WATERPROOF AND WEATHERPROOF. Non-flammable, flame retardant → 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. HASSLE-FREE PURCHASE: We provide 365-day customer after-sales service So that our customers can buy with confidence. If you’re not satisfied with the purchase for any reason, Please feel free to contact us at any time. SIZE: (48INCH X 20FT) R7-21, MADE IN THE USA, MEETS ASTM FIRE CODES, CLASS 1 CLASS A FIRE RATED