Andersen WaterHog Fashion Entrance Mats are made of 100% super-absorbent polypropylene for long lasting durability. The rubber reinforced face nubs and waffle design provide bi-level, crush-proof scraping action. Raised water dam border traps dirt and water to help keep debris off floors and carpets. The border also features the same 100% polypropylene fiber system as the mat surface. Good for indoor and outdoor use. The SBR rubber backing contains 20% recycled material. Certified slip-resistant by the National Floor Safety Institute. Med Gray 4' x 6'.