This radiant barrier is a Class 1 / Class A fire-rated radiant barrier that has passed the ASTM E84 test & ASTM E2599. It is made of one layer of closed-cell foam bonded between two layers of highly reflective metalized aluminum polyester film, providing industrialized strength, and lightweight yet durable insulation that can hold staples without tearing. The price drops from $24.86 to $17.77. Shipping is free for Prime members or on orders over $35.