Diaper Liners are laid on top of any cloth diaper, next to baby's skin, and are used for a variety of purposes. Flushable/disposable liners are used for convenience with poop removal (just lift the liner and flush!). Microfleece liners are used with fitted and prefold diapers to wick moisture away from baby and into the diaper. Both types of liner can also be used to protect your cloth diapers from diaper cream build-ups (if and when diaper creams are used).