Features include: High Density, Rip Resistant Polyethylene Material, UV Resistant, 4-5 mil. Thick, 8x8 Weave Count per Square Inch, 1000 Denier, Lightweight, Approximately 3.1 oz. per Square Yard, Original Blue Color, Heat Sealed Seams. Rope-lined, Heat Sealed and/or Double Stitched Hems, Aluminum Rustproof Grommets Approximately 3 Feet Apart and in Each Corner, UPC Coded. WEATHERPROOF: UVI (Ultra-Violet Inhibitor) Treated for Sun Resistance, Waterproof, Mildew Resistant, Rot Proof, and Resistant to Most Chemicals.