The mat still moves regardless of the spikes on the bottom of the mat. But either way it was a good size for the room and the chair easily glides over the Mat
I am very happy with this mat. It's a good size and thickness. However it was delivered without any packaging - not even a band tying it up. It was left propped against the front door in the rain. Had to struggle to get the door open struggle to get it inside wait for it to dry then wipe it down (wasn't too dirty).
I think the material is too soft. The chair wheels are leaving indentations when I sit in the chair. The last mat I got at Staples was tougher/stronger.
The mat is so flimsy the chair without anyone sitting on it sinks into the carpet. When you sit in the chair it is very difficult to roll around because the mat cannot support the weight.