This pocket nappy is a one size style with adjustable rise snaps and adjustable velcro for around the waist. It is made of durable and water resistant PUL outer fabric, the inner lining is fast wicking microsuede. Material:- Outer Layer: Water resistant printed PUL- Inner Layer: Wicking Microseude Features: - Size: Approximately 4 - 17 kg (depending on size of baby) * For those that have used AlvaBaby nappies, these are very similar in size to these. - Adjustable sizing - S, M, L all in one size. (Please adjust the snap buttons according to the body size of baby) - Easy to use velcro waist, get a perfect fit every time no matter who is fitting the nappy.