Check the listing for details. USEP AD5 Premium Reflective Insulation Roll Foam Core Radiant Barrier 4X4 R8. Condition: New. Listed at 18.88 USD. EXTREMELY EFFECTIVE - Reflect 97% of radiant energy, perfect RADIANT BARRIER. R-value up to 15.62 (1 layer), up to 21.10 (2 layers) (building envelope) 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 utility knife or scissors and installs easier than fiberglass. Simply staple, nail, glue or use a spray adhesive to hold in place! No mess, and no itchy fibers! Waterproof, Not affected by moisture or humidity. Inhibits condensation and does not promote the growth of fungi, mold or mildew. Does not promote nesting of insects or rodents. 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. As well as provides benefits of soundproofing Class 1 Class A Fire Rated / Made in USA / Ships from USA / Super Fast Shipping Size 48inch x 4ft CLASS AD5 1/4 (NOMINAL THICKNESS)