These are for use with traditional flat diapers or large and toddler sized fitted and deluxe aios. They are made of 2 layers of absorbent 100% cotton terry and 1 layer of super soft 100% cotton flannel. They are oval shaped. These offer that extra needed to keep baby dry at night or for a little while longer during the day. They may also be used as a preemie diaper. $2.50 each or 6 for $14.00.