These one sized water diapers are perfect for any water loving little ones 8lbs to 35lbs. The outer layer is a pul (polyurethane lamanent) print and the inside is high quality athletic mesh. This makes them lightweight and breathable for mobilty and comfort. Heavy duty kam snaps across and down the front allow the diaper to be worn from beginning to potty training. Pre wash all diapers before use.Machine wash on warm setting (up to 95f/35c) and tumble dry on low. For best results line dry. Warning- do not use rash creams, fabric softener, sanatize cycle, or any bleaching agents. This will cause permanent damage to the diaper fabrics. This item is made of pul and kam snaps.