The quality of our products is very good,Through strictly test.Our products have a widely used:Asphalt saturated organic felts are designed as an underlyment product to be applied over the roof deck prior to the installation of asphalt shingles.Installl asphalt saturated orgnic felts as a secondary barrier to moisture caused by wind-driven rain and ice damming. Features and benifits:1 Heavy organic mat. 2 High asphalt saturation 3 Heavior rll weight 4 Tightly wound rolls-less telescoping 5 consistent roll lengths 6 Excellent standard packaging. 7 Highly visible alignment lines. 8 High tear strength. 9 Easier roll-out-less sticking. Storage and handling Asphalt saturated organic felts require protection form damage and the weather. store rolls upright in a dry location and never install when wet or over a wet roof deck. Asphalt saturated organic felts require protection form damage and the weather. store rolls upright in a dry location and never install when wet or over a wet roof deck.