Liners and boosters are great accessories for cloth nappies. Liners are used to wick moisture away from babies bum or to protect cloth nappies from stains. They can be reusable fleece or silk, or single use paper.
Boosters add a little extra absorbency to your reusable nappies to save you from leaks - you can even fold a reusable wipe into the nappy to provide a little extra absorbency without too much bulk.