The Basix Modern Cloth Nappy by Cushie Tushies is an All-In-One design and does not require a cover. This nappy contains an outer layer of deliciously soft Minky, a layer of waterproof PUL and two large layers of absorbent bamboo inside the wet-zone, and an inner lining of matching microfleece against baby’s skin. The huge, snapped in booster contains another two large layers of bamboo for added absorbency and is topped with another layer of matching microfleece material. The Basix's One-Size-Fits-All design has been tested on boys and girls from newborn to toddler with great success. To fit our nappies on a newborn to approximately 5kg, you will need to shorten the rise at the front by folding the top down. This will also reduce the size of the leg holes, preventing leakage, and the nappy will still fasten at the front as normal.