Thinner than expected. Put it on low pile carpet. Chair made deep indents. Had to put a board under it which lessened the indents. Would work best on hard surface.
This mat is the right size for my den which has very thick carpeting. The previous mat was too small and I kept running the wheel of my chair off of it and they would get stuck. I would have to get up and lift the chair back on the mat before I could resume working. This mat solved that problem