Cloth diaper covers are the waterproof outer cover needed over many absorbent cloth diaper styles, like fitted, flats, or prefold cloth diapers.
If you're wondering how many diaper covers you will need, most parents find that 4-6 diaper covers are enough to use for full time cloth diapering, but you may need more if you are going to wait more than 2 days before washing cloth diapers. Other parents like to have a larger number available so they can rotate through a large number of cute prints and colors. Note diaper covers can be used for more than one diaper changes. If they don't get poop on them, they can be used for multiple diaper changes. In addition to laundering them with your cloth diapers, they can be hand washed and left out to dry.