Set up the mat in my home office put the chair on the mat. Hadn't even sat in the chair on the mat and there were already dents in the mat. Dents just make it harder to roll around in the chair
This chair mat is good quality and the right size and lays completely flat. Three absolute reasons that I chose it and I was not disappointed. It was more than I expected to spend but I was willing to pay the price because of the quality that was explained. I would recommend this item.