I needed a clear mat  for my small office space.  This mat fits the bill perfectly.  It adheres to the carpet without damaging it and stays put once you lay it down.  My chair rolls easily on it.  This is my second mat - the first one broke into pieces after awhile but I think that is because I also used it under my eliptical machine which is not what the mat is designed to hold.  I liked the mat so much I ordered another one - I've only had it for a month but there is no sign of cracking or breaking since I now only use it for my chair.