Unique ridged construction effectively traps dirt and moisture beneath shoe level. No other mat in the industry traps water and dirt so effectively. WaterHog mats are constructed of rubber reinforced face nubs and the "diamond" design provides crush proof scraping action. Raised, "Water Dam" borders trap dirt and water keeping floors cleaner and safer. These mats are perfect indoors or out, especially outside your front door. The border for WaterHog Fashion features the same 100% polypropylene fiber system as the mat surface.