Two layers of highly reflective radiant barrier foil. Contact Temperature Range: -60°F To 180°F (-51°C To 82°C).Mold And Mildew: No Growth. Flame Spread: 0 Astm E84-08. Smoke Development: 40 Astm E84-08. Motor Vehicle Safety Standard 302: Zero Surface Burn Rate. Only Energy Star Rated Foam Core Reflective Insulation on the planet!! Blocks radiant heat by up to 95%. Reduces Heating and cooling loss. Foam Core Sound Reduction Technology. Easy to use and install. Requires no protective clothing or special tools. Meets new ASTM Fire codes.