Small will fit Goodnite S/M size.  works well!
We have a heavy wetter where standard overnights were no longer adequate (Huggies Goodnites).  we purchased the small size and it is a snug fit within the S/M Goodnites, but it works very well.  no more daily bedding washes since the combination of the diaper doubler and the Goodnite diaper now fully can contain my heavy sleeper's pee.  I was worried once the padding saturates that it would inflate the diaper so much that it would start leaking, but it seems to securly lock in the fluid.  so even when the diaper is fully &#34;blown out&#34; no leaks!
Rating: 5 stars