This mat spans the edge of a very low pile rug. the covered edge of the rug spans underneath where my feet end up when I'm sitting comfortably at my desk. This mat fixes the obvious problem of the rug edge lifting up from being kicked dragged and wheeled over multiple times a day. It is also versatile enough to "fit" on both the hard wood floor and the low-pile rug.
It's functional but too thin for the rug I have. I measured the pile of the rug and matched it to the specs for the mat but it's a bit too thin to keep the desk chair from forming depressions and settling.
This is a good general-purpose chair mat. I needed to trim the tongue in order to fit it into the opening in my desk but that was a fairly easy modification. It's not as thick and heavy-duty as mats I've used in professional office settings but a thicker mat would not have been as easy to trim. I'm very happy with it.