M+A Matting 2240 Waterhog Classic ECO Elite PET Polyester Entrance Indoor Floor Mat, SBR Rubber Backing, 3' Length x 2' Width, 3/8" Thick, Grey Ash Reinforced face NUBS are reinforced with rubber to resist crushing, maintaining high performance and extending product life "Water Dam" border is designed to hold water and dirt on mat to minimize slip hazards and floor damage around perimeter of the mat Raised NUB surface removes and traps dirt and moisture and holds it on mat below shoe level so it is not tracked in Gripping action minimizes movement on most carpets Certified slip-resistant by the national floor safety institute