Librett Green poly tarps are Extra Heavy duty, a great multi-purpose tarp for Pool Covers, Ground Cover, Hunting, Boat Cover, Camping, Utility Cover, Fishing and many other things. These tarps are Water Proof, Tear Resistant, Polyethylene, Crack resistant to -20F, Mildew Proof, Heavy Duty Fiber Reinforced, Rope Reinforced Edges, Heavy Duty Rust resistant Grommets, Washable, Shrink Proof, Rot Proof Overall Dimensions and Finish dimensions will differ.