SmartSHIELD AD-5 Reflective Insulation, Heat-Cold Shield, Radiant Barrier, Thermal Insulation 48''X50ft EXTREMELY EFFECTIVE - R value 21.10, reflect 97% of radiant energy, perfect radiant barrier! VAPOR BARRIER -Unaffected by humidity and moisture, mold resistant , can be used outdoor/indoor! FOAM, NOT A BUBBLES- will sealed the holes from staples or screws itself, will not lose a 5mm thickness over the time, like a bubble insulation! FIRE RATE - Fire rate Class 1 / Class A, NON TOXIC - will not irritate skin, eye or throat. Non allergic. EASY TO WORK WITH - Easy to install, easy to cut and easy to clean, Strong but lightweight.