Charlie Banana Medium /Large Hemp inserts are especially designed for parents seeking natural fibers or for children in need of heavier absorption. Hemp is well-known to have those properties. We recommend that you stuff your Charlie Banana diaper with 2 hemp inserts for longer outings, during nap time, and night time. These inserts have 4 layers inside 2 layers of Microfiber, and two layers of Hemp fleece composed of 55% Hemp, 45% Cotton. This is a great combo because Microfiber absorbs quickly, and Hemp can hold larger quantities of liquid.