Slimtrim flats are made from 100% pure cotton. These flats dry fast after washing. They give a trim fit when folded and wrapped snuggly around the baby. Alternatively, Slimtrim flats can be padfolded to use instead of inserts. The absorbency of Slimtrim flats is very similar to that of hemp jersey flats. We recommend adding a booster for heavier wetters.