Large mat works perfectly for my small area rug and hardwood under my office desk at home. My office desk chair no longer bunches up my area rug and wears on it. This is exactly what I needed.
Don't waste your money on this chair mat. It curls up and then its hard to roll your chair over it. I have had to set heavy boxes on the corners to hold them down but it hasn't helped. By the time I realized that it was just not going to work no matter what I did and wanted to return it I had exceeded the time limit on returns.
This mat is the same size as the one I had previously. However when I roll my chair off of the mat - the wheels gets caught on the end of the mat when I try to roll it back on. I exercise every morning and it becomes a challenge to lift my chair back onto the mat. I had purchased my previously mat from staples however it was a heavier/harder quality. On this mat I see the imprint of the wheels into the mat. I think the quality of the mat has been compromised.