A very important and useful feature about this rubberized floor is the fine corrugated ribs that run along the rubber mat's surface texture. These ribs are ideal for helping to maintain a clean area. If your shoes are dirty, with loose mud and dirt particles wedged in the sole of your feet, you can scrape them against the ribs of these runner mats. Ideal for use as outdoor rubber flooring, these fine and numerous ribs will flush out the debris and make sure your feet are clean before entering the insides ;