Returned item to the store 2 days later. Was too thin chair made grooves and got stuck. Tried to buy next thickness up same size but was not available in the Patchogue store
I have an odd shaped desk. This worked perfectly with a small modification made with some strong scissors. Great to buy from the store and get it set at my desk the same day.
Chair mat is too thin to be effective. Leaving chair on the mat overnight resulted in dimples where the chair's wheels were. Might be fine for low pile office-type carpeting but I'm using in home office with household carpet and it just sinks down too much. I cut 2 ply cardboard to same size as mat to place underneath and that seems to help but it's not very attractive.