These covers and Ai2s are the best fitting diapers I have found. The ai2s have the same fit as the the slim fit cover but with a snap in insert. The Full Fit covers have a generous bumpy area and a wider crotch to fit over any over night solution or if you need a fuller fit for your little. The newborn AI2 has a trimmer fit than the newborn cover
100% Poyurethane outer and inner
Ai2 has a AWJ pedal soaker with a 2 layer 500 gsm bamboo hemp fleece core.
OS Fits approximately 10-45lbs