Strong & Durable Shelter - 20x30Ft 2 Packs Silver and Black Poly Tarp can form a strong and durable shelter from sunlight, rain and dust, cooler underneath in the summer Waterproof & UV Resistant Double-side Used Cover - Made of 100% brand-new PE material and triple coated lamination for double-sided use, silver layer for resisting sunlight in sunny day, black layer for maintaining heat in cold day, both side for waterproofing, UV resistance & not easy to get black stains in wet weather Sturdy Poly Tarp - 10mil heavy-duty thickness and aluminum grommets in 3 1/4 ft (1m) interval for better tear-resistance, weights 19.49lbs; PP plastics capped reinforced corners with grommets for sturdy construction; All seamless edges avoid water leakage