EXTREMELY EFFECTIVE - Reflect 95% of radiant energy, perfect RADIANT BARRIER! VAPOR BARRIER -Unaffected by humidity and moisture, can be used outdoor/indoor. SOUND BARRIER - excellent sound deadening material, effectively blocking sound waves. 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. NON TOXIC - will not irritate skin, eye or throat. Non allergic.