I believe the label on the mat said for medium carpet which is what I had. But my chair wheels would immediately put a visible dent in the pad and prevent the chair from easily rolling around. Maybe this pad would work on a hard surface floor but I can't imagine any scenario where it would work on carpet.
This mat moves when your chair moves. No matter where you put mat in a matter of minutes it will have moved to a different location as you move your chair. It is so flimsy that my chair creates big valleys making it difficult to initiate a position change. VERY disappointed.
This mat needs another mat the same thickness to make it usable. Just too thin for my chair and me to be on it at the same time. When I try to move around on the mat I have to get it out of the 5 chair rollers out of its divit.