A pocket style diaper has a pocket opening between the outer waterproof shell (or cover) and the inner layer that touches baby’s skin. You can place the absorbent material (insert) inside this pocket opening. The pocket style diapers are the most popular style of cloth diapers and don’t require any additional covers. A pocket diaper may be one-size or available in sized options and may have natural or synthetic fibers. Available in both snaps and Velcro closure.