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.
This mat protects the carpet and makes it easier to roll when seated. After sitting for a while it dimples under the castors and would be better if it were stiffer. That being said it is significantly better than nothing but carpet.
It is good for being over carpet but when I sit in my chair it sinks into the plastic leaving prints. I only am 190 lbs. a male. So. It’s not smooth. Those marks stay there. It’s like to memory foam like. Lol
Picked this up at the local store they had plenty rolled up ready to go. It will dent up some if I sit too long in one place (I'm a heavyweight) but next morning it's smoothed out. Chair rolls nicely on it ove the carpet.