20′ x 22′ medium duty 6 oz. Tarp, silver – s20x22 this 20 ft. X 22 ft. Woven poly “sun block” tarp is waterproof, mildewproof, tear resistant and acid resistant. 6 oz. Per square yard, 11-12 mil thick, 14×14 weave count, grommets approximately every 18″, reinforced corner grommet. Finished size approximately 2% or 6″ shorter. Tarp is lightweight yet durable, manufactured from high-density polyethylene and woven into black fabric and then laminated silver on both sides then finished by hemming the edges with poly twine inserted in hem. All seams and hems are heat sealed. Uv treated.