Good sized mat and poly material seems as advertised however chair castors deform even this thicker design so are not free rolling. No matt cracking evident yet after four weeks.
This mat is is the right size and better than some less expensive ones but my chair wheels dent it. It can be hard to move the chair as the wheels get "stuck" in the dips they make into the mat. The chair is also a Staples chair so it should not be a compatibility problem. The bottom line is I recommend finding a different mat one that is not as soft as this one.
Size and shape is perfect. However the quality of the mat is too thin/soft and leaves indentations from my chair and I weigh 125 lbs. It is also not very smooth to roll across. I would not buy this mat again.
It was super fast delivery. I ordered the same from someone else and it took 3 weeks. Staples delivered it next day and it was free. Big hell yea for Staples.