It fir well under the knee-well. It seemed to protect tghe carpet. It was a see-thru panel. However it seemed to be too light duty for the servic. That ios to say the indentations under the chair's wheels were very noticable. We think the plastic will not lasat long.
I put this chair mat on a low pile carpet but the mat had a tendency to creep forward which eventually put it in contact with my desk. It happened repeatedly. Not good. The legs of the chair also left an indentation on the mat. Not good.