This product is flimsier than I anticipated. It was already 'indented' with the chair just sitting on it (without me) after just a few hours. That's the problem with on-line purchases; you can't really tell what you're getting until it actually arrives. I needed to get something more solid.
It is a nice chair mat and would have worked well had I paid more attention to the actual measurements. Unfortunately it was a little small for our needs and I had to return it. But I would not have returned it had it fit.
I have a concrete floor with a pad and a carpet on top. This must be too much padding as the mat stretches and leaves indentations in the mat which make it hard to roll the chair on. So far it has been 5 days and the depressions have not recovered. Also I work barefoot and the mat seems to be very sticky! on the plus side it fits in the space I wanted to cover.