Check out these top quality tarps! All medium-duty tarps have an eight by eight denier count, as well as a thickness of six mil per square yard. In addition to this, our tarps are treated to be waterproof and UV resistant, as well as rot, mildew, and mold resistant. Blue tarps have multi purpose uses. They can be used to protect your RVs, Tents, Boats and as a Pool Cover.