Diaper covers provide the waterproof outer layer for fitted, contour, and prefold diapers. Usually made from polyurethane-laminated cloth (PUL), covers styles include pull-ups, which are elasticized around the waist and legs, or wraps, which are fastened with Velcro or snaps. Covers are also available in wool, a naturally water-resistant fiber. Because diaper covers are made in specific sizes, a baby might require two or more sizes of diaper covers over the course of diapering.
