Rust-resistant aluminum grommets every 3 ft. and at the rubber-reinforced corners for rigging or securing Highly-durable UV treated polyethylene with 8 x 8 weave, 4 mil (0.10mm) thickness can withstand the elements Waterproof, mold, and mildew resistant to protect your goods during the rainy season Seams and sides are heat sealed and the edges are reinforced with a polyethylene rope in the hem 30 x 50 ft. size is spacious enough to cover boats, trucks, tents, and so much more Highly versatile option for uses like storage cover, tent base, boat cover, ground sheet, and woodpile covers