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.
The floor protector is a thinner plastic but does what it is suppose to. You can see the indentation of the office chair but it is protecting the floor.