99% Reflective Solid White / Foil Vapor Barrier ? Optimal Thermal Performance. Waterproof Material Unaffected by Moisture and Humidity / Strong and Durable / Radiant and Vapor Barrier ? All in One. One side is a White Vinyl Finish / Other side is a Foil Finish. 1/4 thick True Double Bubble. 12INCH WIDE X 10FT LONG.