Roughneck 2.3-Oz. Medium-Duty Poly Tarp - Blue, 20ft. x 30ft. 3-layer construction for superior durability Tightly woven 8 strands per inch x 8 strands per inch weave of polyethylene fiber Woven fabric has a double laminated coating of polyethylene, producing a 2.3-oz. per sq. yd. tarp Provides good tensile strength and tear resistance Tarp is waterproof, rot-resistant and resists cracking in cold weather