These nappies require a cover.
Use them coverless for old-school comfort and style in summer.

Fitted nappies are a great choice if good absorbancy is what you are looking for. Used mainly during longer wears and overnight.

Flat nappies are an economical choice, for frugal nappying as well as for early newborn days when nappy changes are frequent.
As baby outgrows them, flat nappies can be repurposed as nappy boosters or pocket nappy inserts.