I purchased this pad to go under the pen that I also bought from Wayfair. Our puppy is 16 weeks old and we are in the potty-training phase. This is bigger than the pen so I don't have to worry about any leaks and she has no issues with using the potty on it when we are not home. I love that I can throw it in the washing machine. We do lay down the training pads on top of this mat as well.