When loading fertilizer in a warehouse where the leeching is very hard to keep out of your truck, I was desperate when my boot brush fell off. At a near by truckstop, I found a white mudflap with the "astroturf" looking stuff attached to the back of the flap. After mounting a peice on my step, I found it worked great, and lasted longer than the mats from walmart. Pulling into truckstops, I check for any that have been pulled off, for spares. Wife has found that they also work great at the back door of our home.