Paid extra for this mat because it was suppose to be the best for medium thick carpet. There is NO GRIP whatsoever on the back of this mat. Constantly having to slide it back over so my chair wouldn't roll on the carpet. Maybe I move too much but hey carpet mats are supposed to make it easier to use your rollers! The material is very strong but design is bad.
I bought these mats before and they lasted about 9 years - depending how much you roll your chair on it :) It was time to buy another one and it still has the same durable feel to it.