Got the mat home and placed it on my bedroom carpet. I weigh 210 and am using a 25-lb. 5-leg desk chair. The Staples economy chair mat now after 1 week has permanent dimples where the chair wheels sit when I am rolled up to my desk. I believe this chair mat is too thin.
Mat arrived dirty without a box. I had to hose it off outside to get the dirt off. It is also soft plastic so when sitting on the chair it leaves imprints from the chair wheels in the plastic. I would not buy again.