The mat is thin and my chair sinks into it as I sit. So much so that it’s hard for the chair to roll after a while. Also the bumps on the bottom that are supposed to keep the mat in place on carpet don’t work. The mat migrates and has to be repositioned every few days. Not happy at all.
Bought this mat with a new chair (which I love!) and found it to “dimple” under the chair wheels making it hard to roll. Thicker plastic would help it keep a flat shape.