I have tried so many pet pads for my 3 small elderly dogs, I've tried them all from Amazon and from the pet stores. These are heavy duty, they do not leak through unless they miss the pad and now I use underneath the Kluein washable pads that I also bought on amazon. These do not leavea bad smell behind and if they miss the pet pad a little the kluein washable pad catches it. saves me from washing my floors hourly. being in a highrise this is a great solution. Not having to use paper towels and cleaners hourly. This will save money in the long run.