Gosport Manufacturing Poly Tarp Aluminum Grommets: Rustproof grommets spaced every 3 feet and at corners for easy securing Mildew & Rot Proof Cold Resistant to -20 F / -28.8 C 30 micron polyethylene coating: Coating on both sides for durability Rope-Reinforced Hem: Poly rope around the edge for reinforcement during tie down