This chair mat fits my needs and is just the right size. Part of it goes under the desk where my legs and feet are and the rest of the mat is secured to the carpet by small plastic rivets to keep it from moving. Great product.
This is a nice chair mat for the price. It works just fine but I will say it is a bit thinner than other mats I've had. It has developed slight dents/grooves where the chair wheels sit so I have to give a push sometimes to get my chair to roll free. I have this mat over an area rug so maybe this wouldn't be an issue if you are using the mat on solid flooring rather than carpet. Overall I would recommend and buy again for the price.
After the first time I sat in the chair in front of my computer the chair left notches in the surface of the chair mat. I guess I should have gotten a mat with a harder surface.
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.