This product is SO incredibly cheaply made, I CAN'T imagine WHO uses it, and for what? TWO attempts to use this product failed almost instantly. The zipper teeth are made from an incredibly cheap plastic. I wasn't rough with them at all and they broke; and there was NO possibility of repair. I was totally shocked at how flimsy the zipper is... HOW in the world does this work for "tarps?" People yank on tarps... it's ludicrous. DON'T BUY THIS JUNK PRODUCT!!!