this mat is utterly useless. my empty chair creates deep depressions in the material it is completely useless on a medium to low map carpet. I gave it one star only because 0 stars were not an options. don't bother with this vinyl is an inferior material for this use. go with poly-carbonate or just make your own out of pergo.
My Chair is leaving dents in my 45X53 High Pile Carpet Chair Matt. Lip. I do not know if they are permanent or not. I believe I would prefer a thicker Chair Mat that does not bend around the casters on my chair. I am afraid this mat will crack with repeated use. I have had the Chair but a week. I will continue to use it until I can determine if Matt is going to crack up like the last one or not.
The chair mat was left in my carport all crumpled up. I allowed it to lay flat for five days before installing it. The edges would not lie flat and I kept tripping on them. The chair wheels would indent in the mat making it difficult to roll. Very disappointed.