I have what I was told os medium pile carpet.I have an office chair purchased at Staples a year or so ago. The mat slips and every few days I push it off yhe mat so I can move the mat back in place and not curling against my desk leg.and then placing this heavy chair back on the mat. I also have depressions on the mat from the casters. the mat shifts I suppose because of movement of the chair.
The Staples Hard Floor Chair Mat 46x60 is clearly stylish and serves its purpose of protecting the floor from office chair friction which can eventually damage the flooring.