Went to purchase chair mat in store. This was only model they had. Too thin. After only a few hours rollers on chair created permanent divots in mat. total waste of time and money.
Super thin mat not really great for carpet as the wheels sing in and prevent chair from moving freely. However it does protect the carpet so it gets 2 stars for that.
I did need twice of how for a largest my chair needed on top of a rug this idea did the well very well. As usually got my idea at the Staples for my idea get there and get the best!