I had one of those mats under Babalus cage in our other house and I did not like it to much... It was over carpet, and the weight of his cage put dents in the mat so it was a tad bit difficult to move the cage off of the mat. Also, I might have gotten a mat that was to small (due to price) but my cage did not fit over it to well and poops still hit the carpet. I had to make a cut and push the mat in front of the cage so the back was not over it. After some time the corners also started to bubble up and if you walked to close barefoot, ouch! Anyway her is a picture of mine, so I guess my point is, if you get one of the office mats, get a large one.