This is a huge litter box for my maine coon cats so I was worried about the mat not being big enough. to my surprise, it opens up so it fits the box perfectly. I use the second one folded in half (option given by design) for the smaller box. I'm very pleased with this product!
it's useful and helps decreasing the amount of litter on the floor. my only complaint is that it's too small my kitty likes to jump out of the toilet at weird angles and so always manages to spread the litter beyond the mat... its wonderful with keeping the litter that does fall on it in place.