18ft x17ft Blue 6-mil Waterproof Poly Tarp Camp Tarp Tarpaulin for Camping Tent Shelter Shade Canopy Grommets every 36" in order to allow secure tie-downs. Sides are laminated, all edges are reinforced with P.P. rope and hems are reinforced. Waterproof, mildew-proof and washable. Size 18 feet x 17 feet