Too late to return it now. The mat is too thin. Maybe my carpet was too thick. The chair would sink in the mat. When I would try to move my chair I had to push it out of the indentions that were made in the mat.
This mat was a little more expensive than my previous one but it's much more firm and larger so I don't find my chair getting stuck halfway off/on the mat. It is very sturdy and makes it feel like I am on a hard floor. I'd recommend spending a few extra bucks for this mat. I can tell it will hold up for years.