Swaddlebees Contoured Hemp Inserts are made of five layers of quick-drying, certified organic cotton/hemp fleece. They are specially designed to fit the unique contour of the Swaddlebees pocket diapers but can be used with any cloth diaper to add extra absorbency. Expect some shrinkage in length when washing. Available in three sizes. Note: You will need to wash your hemp at least 4 times before use to prime it properly. Your hemp will become more absorbent the more times it is washed.