I have a five legged caster office chair. The mat develops indents under the casters and it is hard to move sound. Plastic should be thicker to avoid indentations.
Do yourself a favor and buy the more expensive chair mat .. .I wish I would have. I had a mat for 10+ years on a hardwood floor but now I needed one with grippers to go over carpet. It STILL slides and my chair wheels make huge indentations. Get a better mat! Not a great choice too thin.
The mat that this mat replaced didn't show dents in the mat or the floor. I had it over 10 years and it was starting to crack. Guess it was more plastic and durable than this rubber mat. I do think this mat will last a year. I am 5'2" tall and not overweight but this mat has dents in it already. Are you sure you want future reviews from me?