This carpet protector seemed to work for for about 6 months but then developed a tear which turned in a large hole making it useless. I'm going to contact Staples about a no charge replacement under warranty.
A good serviceable mat for the money. Would have preferred a rectangular mat of the same dimensions without a lip but for the price I can live with it. Only downside is that previously purchased mats of the same kind have tended to crack and break apart after only about six months of use. These do not smell of polypropylene for a time after installation as do some competitors.