Three-Layer Construction of Specially Reinforced, Laminated, High-Density Polyethylene Fabric, Water, Rot, and Mildew-Resistant, Crack-Resistant to -20 Fahrenheit, Rustproof Grommets on Each Corner and all Around hem, Poly Roping Sewn into Hem all Around for Extra Strength, Tough with Reinforced corners, All-Purpose Utility Covers, Regular Grade Tarps 8 x 10 Weave, Aluminum Grommets every 36'' Around Hem and at Every Corner.