Heavy Duty Silver Tarp 6 OZ., 12'x20' HEAVY DUTY: Tarp is 11-12 Mil thick, Fabric weighs 6 oz. per square yard PERFECT FOR USE IN ALL WEATHER: This polyethylene tarp is UV treated, Waterproof, Mildew, Acid and Tear resistant. Great for use in direct sunlight, rain, snow and more EASY TO TIE DOWN: Rustproof aluminum grommets approximately every 18 inches and at the corners SUNBLOCK: This tarp blocks 100 percent of the sun rays. Great for providing shade on decks, patios, or anywhere shade is required CUT SIZE: Measurement of this tarp will be 6 inches or 3% to 5% shorter than listed size