This mat was to replace an older similar mat that had cracked with age. The new mat does not lie flat it wants to "walk" (move) on the carpet with every roll of the desk chair. The current carpet (rug) is thicker than the previous one so that may be part of the problem.
This was exactly what I needed to replace one that was completely falling apart. My chair moves very well on it and I would recommend it for anyone who is looking.
the product is supposed to remain in place on a plush carpet. it does not! i paid almost twice as much for this expecting that the little "grippers" on the bottom of the mat would be longer than the non-plush version. that is not the case so i am still constantly putting it back in place. not worth the money.