The cover is made from s-t-r-e-t-c-h-y knit and coupled with a clever snap configuration you can alter the size and fit as baby grows. The pocket on the inside of the nappy lets you slide in the absorbent bamboo boosters prior to fitting onto baby. Pocket nappies were developed from the all-in-one style - where the layered absorber was sewn inside - but they took an age to dry. The soft lining that sits next to baby’s skin is a super-soft microfleece that draws away moisture to the bamboo boosters, protecting baby’s skin. With pocket nappies the most important thing is to get the boosting right for your baby's need, a light wetter may only need one booster, most will need two and possibly three for overnight.