Pocket Diapers are two separate pieces. The shell consisting of 2 layers- an outer waterproof layer and an inner layer of microfleece-and the insert. The shell layers are sewn together on three sides, creating a pocket in which you stuff an absorbent insert made of hemp, terrycloth, microfiber, or a combination of these. When your baby wets, the moisture is wicked through the microfleece and into the absorbent insert, so baby's skin stays dry. To change the diaper, unsnap or un-velcro the diaper and remove the inserts. These are one-time use diapers--do not try to reuse the shell.