Fitted diapers are a great choice for parents wanting natural fabrics next to their baby's bottom and who want to control what is used for the cover. They are a shaped diaper, elasticized at the legs and waist, and fastened with snaps or aplix. They come in a range of natural fibers, all very breathable. For many parents this is their diaper of choice for nighttime, with absorbency boosted with doublers. Fitted diapers do require a cover.