13 x 20Ft Extra Super Heavy Duty 12 Mil Thick Waterproof Brown Pure Tarp Cover Sheet & 6 Pcs Bungee Balls. EXTRA THICK & STRONG: Durable 200 GSM/12 mil Reinforced Tarpaulins Protective Cover. UV RESISTANT, WATERPROOF AND WEATHERPROOF: You can use the ultra-thick tarpaulin throughout the entire year, whether its windy, raining, snowing or raining.