I bought a chair mat from another company and after a couple months there were. Racks all throughout the mat. I ordered this one from Staples and no issues!
This mat is absolutely perfect for my office. It makes a huge difference when sitting on carpet. There are no chemical odors and the mat did straighten out in a couple of days.
It covers the area where my desk chair stands it covers the carpet there. That saves the carpet from the chairs wheels and covers the carpet from spilled drinks.