I ordered a chair mat for Low Pile Carpet from another source and it works great. I recently ordered a few more from Staples and we sink into the carpet. It seems that the chair mat is not sturdy/ thick enough to prevent the rolling feet of our office chairs from sinking into the plastic making it difficult to roll.
Carpet was delivered not rolled evenly - would not lie flat when placed down. Had to place heavy boxes x several days to get the "waves" out of the carpet so that it would lie flat.
The Chair Mat we had for more than 10 years was falling apart. When I checked the internet how much they cost Walmart was the cheapest. So that's where I planned to buy it. Then there was an email from Staples: 25 % off for 1 item only for that day! End of the story cheaper at Staples. It is a beautiful mat. Fits perfect under and in front of the computer desk. Heavy plastic and sticks nicely to the carpet. A great buy for a super price! Thanks.