The casters on our desk chair leave deep indentations in this chair-mat. Similar products we've used have not done this and have felt more substantial.
Product will not hold up under heavy use. OK for light use or light people. Standard chair wheels with two disks at each of five support points on plush carpeting will create permanent indentations over time. Premium chair mats are available up to 200 mil thickness. I exchanged for a bamboo mat which looks and rolls great.
I am heavy and have 1/2 inch deep carpet so I ordered a mat for 1 inch thick carpet so as not to dent it too deeply to no avail. My empty chair even leaves shallow dents. It is NOT thick or hard enough. I could have paid 30% less for this quality in a differant brand. I am disapointed and may return it.