How to choose a Poly Tarp (Polyethylene Tarpaulin)Poly Tarps are one of the most popular tarps available to consumers due to the wide range of colors, sizes, weights/strength and price. You need to select the right tarp for your application whether you are covering a canopy, carport, construction job, tent frame, outdoor event, yard project or wedding. [Construction]Poly Tarps are typically made of multiple layers with a woven mesh fabric sandwiched between two or more polyethylene sheets. [Reference Parameter]Tarp Thickness– This is the actual thickness of the tarp measured in mils (1/1000 of an inch). The larger the number, the thicker the tarp. Typical light weight tarps found in most retail or hardware stores are about 4~6 mils. If you are planning a heavy duty use, such as covering a carport, consider a heavy duty tarp at 10 to 12 mils or a super heavy duty tarp at 16 mils. Reinforcement– Tarps have additional reinforcement around the perimeter of the tarp to help prevent ripping and tearing.Perimeter rope– This is a rope which has been sewn inside the hem at the edge of the tarp to add reinforcement strength to the tarp.Hem– The hem is formed by folding the edge of the tarp back onto the tarp and then stitching the entire hemmed area. [Warning]Flammable. This Product will ignite and burn if brought into contact with an open flame.Suffocation hazard. Do not allow children to play with tarp.