We have purchased 3 different mats unaware they all had the same problem. We live in a new build home and were told to use the high pile carpet mat. Unfortunately it's still flimsy and so thin that even just the weight of our commercial office chair leaves indentations in it. When a person sits in the chair on the mat you sink into the mat so much you have difficulty rolling out of the sunken spot. I guess my husband will have to invent his own mat that isn't so cheaply made... We will be returning it.