This mat is approximately 20" X 40", I got this to try out in front of my kitchen sink, I have no dishwasher so still hand wash dishes, and after spending eight to ten hours on my feet at work, the hard floor was a little too much. This mat is midnight black, and I swear it is just what I needed to stand at the kitchen sink! Very comfortable and cushy, reduces the strain on feet, legs, knees, hips and back. Contains an Antimicrobial ingredient that will not wear off or wash away. Ever!! Extra thick polyurethane with fine antimicrobial polyester covering, guaranteed to remain flat and not curl up. Also anti slip base so it will stay where you put it and not slide across the floor or trip you. I am so glad I got this, it has added a great deal of comfort for me. Three thumbs up!!