Liners come in a few different types, first there are the most common: 1. Biodegradable flushable liners which help catch the fecal matter & make it easier to clean baby up, or protect your cloth diaper while using diaper creams. These types of liners are placed next to baby's bottom & simply thrown out after a poopy is made or flushed! (urine saturated liners are also compostable!) & 2. Fleece / raw silk hemp liners are also available to use in the same manner, except they are washable. Silk may not be as absorbing as fleece, however, they have natural healing properties & are an excellent alternative for babies that can't use fleece.  Fleece liners have the added benefit of wicking moisture away from your child.  This can be ideal for use with natural fibers, especially at night.