I have high pile carpet and I'm not a small person....so the chair mat needed to be thick for both reasons. This one works well. Whatever denting I've put into it seems to disappear after an hour of not being used. The bigger size is useful too.
I bought this for my husband's office chair as he had worn a path down on the carpet pile and I had to shampoo it a lot! This mat works great for our office on 1/4" pile carpet easily with no slippage.
Good Thickness QUICK Delivery easy install just let lay in sun for about an hour it will flatten out and relax so you can easily put under your desk. If that doesn't work try placing some heavy books on any area that is curled up that will help it to flatten out. I would have paid a little more if it could have been about 4" to 6" longer (36" x 48") 36" x 53" would have been perfect. However the width is exactly right for my desk. I looked and compared it to other chair mats before purchasing but nothing compared to this one for the price. if I sit in the same place for a long time it will indent the mat but it recovers a short time later. This is due to the fact that the carpet underneath the mat is somewhat plush and not a fault of the mat itself. Would purchase it again if in the market for another mat.