measured the carpet pile to pick the correct mat. if I sit in the same spot for a few minutes the wheels cause a dimple in the matt. it takes a push to get the chair to move. the dimples come back to a flat surface but not easy to roll around on.
This is a good mat and the price was right. But even on low plush carpeting it is a bit too soft. after sitting a while in one place the wheels tend to sink into the grooves making it harder to push away from the desk. I probably should have gotten a harder surfaced mat to place under my desk chair.