This Staples Model #: STP-17436 which was in stock at my local store and was supposed to work with an 1/8" flat pile rug but was too thin and chair would not roll. Returned and purchased model 20229-CC designed for a 3/8" flat pile rug which works just fine. I have three of these.
The mat is satisfactory. However the thickness is insufficient to prevent chair wheel depressions in the mat after sitting too long before moving the chair.
I'm not completely satisfied with the chair mat as it is too short for the depth of my desk. The wheels leave deep gooves in the mat that I have to "oomp" to get it out. It also does not stay flat on the edges so I'm constantly kicking it. I've always wanted one but now I regret getting it. Sorry!!