Tarp 6×20 ft Heavy Duty 12mil 100% Waterproof High Durability Multipurpose,Uv Resistant,White Tarp Suitable for Swimming Pools, Boats, Camping, Courtyards, Etc -by MVPNET. Size: 6×20. Multi Functional Waterproof Cloth:MVPNET heavy-duty white waterproof tarp has a thickness of 12mil and is made of HDPE material.