The size indicates the length and width of the tarp. However, a tarp's thickness is measured in mils, which is 1/1,000 of an inch. This means that the more mils a tarp has, the thicker it is.
When you put your barbecue away for the winter or cover your bike or car to protect it from the worst of the weather, the chances are you use a tarpaulin. Over the centuries this strong water ...