Harpster Tarps Heavy Duty White Poly Tarps are waterproof, tear and acid resistant. Polyethylene fabric weighs 6 oz. per square foot and is 11-12 Mil thick. It is laminated white on both sides. Grommets are spaced approximately every 18 inches and in the reinforced corners, for plenty of tie down options. Our white tarps are perfect for canopy tops because they are translucent (allows some light through). UV resistant makes this tarp perfect for outdoor and indoor use. Harpster Tarps Heavy Duty White Tarp is perfect for covering cars, boats, and firewood. Many additional usages including camping, hunting, fishing, beach trips, picnics, RV trips, outdoor movie screens and much more.