Easily deformed plastic chair wheel depressions within one week. Our chair has five wheels to spread the weight and both my wife and I are very thin. Our carpet is indeed only "medium" pile. Product engineers and/or labeling team missed the mark on this chair mat.
It dies not stay in pkace and the weight of the chair alone leaves dimples. It is hard to roll the chsir when seated because the chair rollers sink into the mat.
This works well to protect the carpet. I have an area rug and it is to thick and has padding. This would be great on a commercial grade carpet with low pile and no padding.