EXTREMELY EFFECTIVE - reflect 95% of radiant energy, perfect RADIANT BARRIER. VAPOR BARRIER -Unaffected by humidity and moisture, can be used indoor/outdoor. SUPREME QUALITY - 3mm closed cell polyethylene FOAM ( not a cheap bubbles) sandwiched between highly reflective Engineered Foil on both sides. Easy to install, easy to cut and easy to clean, Strong but lightweight. SOUND BARRIER - excellent soundproofing material. NON TOXIC - will not irritate skin, eye or throat. Non allergic.