If you are looking to add absorbency to your cloth diapers, we recommend using a doubler. Doublers/Boosters can be used inside any diaper to provide a "boost" in absorbency and are often used for naptime/nightime.
Inserts are used inside pocket diapers to provide absorbency. Natural fiber inserts (cotton, hemp, bamboo) can also be laid inside a cover to provide absorbency. (Never place microfiber directly against baby's skin - it is too drying and can irritate the skin.)
Liners can be laid in any diaper next to baby's skin to provide a stay dry feeling, to make the disposal of waste easier, or to protect your diaper from rash cream.