I am heavy and have 1/2 inch deep carpet so I ordered a mat for 1 inch thick carpet so as not to dent it too deeply to no avail. My empty chair even leaves shallow dents. It is NOT thick or hard enough. I could have paid 30% less for this quality in a differant brand. I am disapointed and may return it.
I wish they could make this product a little more rugged. I weigh 130 lbs but my chair gets "stuck" in indentations created by the castors and makes it difficult to roll my chair. I have to buy a new chair mat every few months as it starts cracking really bad. It has "grippers" to keep it in place on the carpet but it still manages to slowly slide out of place.