If you are looking for a mat that will have a stable surface over a deep pile carpet I highly suggest that you look somewhere else because after much time studying the catalog Staples offers this was the best I could identify and it is inadequate. Problem is that the plastic is soft and very pliable. The wheels of the desk chair sink in and form a deep pocket very quickly Then attempting to roll the desk chair to another position it's stuck in the pockets so moving takes more effort that anticipated. Many Years ago I purchased another high-end mat for my wife's desk I might have purchased it from Staples. It is over the same carpet: no issues; stable; no cracks; and flat.
The mat works really well and is much better quality than the original one I purchased. Scott was very helpful helping me pick it out and he even carried it to my car. I would recommend the mat to anyone who wants to protect wsomewhat deep pile carpets.