This is not a good chair mat. It replaced a 15 year old mat that cracked. This one is soft and the chair sinks into the plastic, and I have a normal BMI; I am not heavy. The chair doesn't move smoothly because it sinks into the plastic. Terrible purchase. There are also black marks all over it. Not sure if they're from my shoes or the chair.
Plenty of size options for this style of chair mat. This one is just the proper thickness for our low-pile carpeting. Love the 'nubs', rather than the 'old school' sharp spikes on the underneath side !! Really like the 'ramp' option around the edges. Found this at a great price too !!!