M+A Matting 2297 Waterhog Eco Premier Fashion PET Polyester Fiber Indoor/Outdoor Floor Mat, SBR Rubber Backing, 6' Length x 4' Width, 3/8" Thick, Grey Ash Reinforced face nubs Raised nub surface: removes and traps dirt and moisture and holds it on mat below shoe level so it is not tracked in Trigrip backing: gripping action minimizes movement on most carpets Durable pet polyester face suitable for indoor or outdoor use Easy to clean: just vacuum or hose off and hang to dry