The mat does not work as expected and I do not weight more than 190 lbs. The carpet was measured before I purchased and my chair sinks into the mat. Not happy.
It is a great mat if no one sits in the chair. With someone in the chair the casters make big dimples in the mat which makes it difficult to move the chair. The cleats on the backside are not deep enough to prevent the mat from sliding. I finally had to screw the mat to the floor.