The plastic is not very thick so there are indents from the chairs wheels. otherwise it makes it easier to roll around. also protects carpet it was nice to have a choice of sizes. Store manager wrapper it in a roll so it was easy to carry.
Rather than going for a more expensive mat I went with this one. After about 3 days of work I have indentations where the chair sits most of the time. Now it seems to always gravitate to those indentations which eventually will probably go right through the plastic. Don't recommend.
The two chair mats we bought work very well at our two work stations: my home office and my wife's sewing machine cabinet. They enable us to move our older office chairs between desks and work tables - over wall-to-wall carpet.