This is for hardwood floors. You can not use it for the carpeted floors. Overall it is a really great product. I purchased this product for my home office. The only problem I had was about the shipping. It comes open item. It was extremely dirty. Manufacturer needs to find a way to solve this problem such as a sticker to keep it clean during shipment which can easily be removed by the buyer. It took me a good amount of time to clean it up. Once clean it was a great solution to protect my wood floors. I gave four start for the fact that I had to spend time to clean it up.
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.
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.