I bought this chairmat for my 90-year old father in law. His was brown and falling apart so he was delighted that we found one that would save his carpet and make it easier for him to move his chair.
Sorry didn't use as chair mat. Works great upside down to keep cats off the furniture! I cut it to fit the pieces I need to keep the animals off. I works get looks better than foil!
These mats are pretty sturdy and plenty big. They're billed as "limited lifetime warranty" and I had one that developed cracks. Staples replaced it and I now have a new one.
The mat sinks into the carpet leaving wells that the wheels on the chair sinks into. Extremely difficult to roll over. I can't think of any other way to describe it...I would say it is only good on hard surface floors not carpeting.