Great for all-weather use the 20 ft. x 30 ft. Heavy-Duty Tarp features a thick plastic construction with a tight weave pattern for protection against moisture. Tarps are manufactured from high density polyethylene, laminated on both sides with low density polyethylene coating which make the tarp strong. The all-purpose tarps have hundreds of applications. Widely used for construction, agriculture, boating, camping, landscaping, roof covering and much more. Heavy-Duty Tarp features a tight weave pattern for protection against sun and rain ; Reusable and recyclable ; Poly rope reinforced hems around the edge for reinforcement plastic cap reinforced corners ; Rust-resistant polycarbonate grommets for tie-down strength Rustproof, aluminum grommets every 24 in