The special raised wall on these mats keeps mud, sand, dirt and snow trapped in while the multi-directional raised ribs allow you to easily scrape off the mud from your shoes. Easy to trim with regular scissors, the computer designed trim lines provide a perfect fit in most vehicles. Having the ability to trim the mats yourself allows for maximum coverage of your floor leaving a neat, lay-flat appearance. Anti-slip nibs on the underside of the mats prevent them from shifting under your feet. All mats are easy to clean and completely washable.