Diaper covers provide the waterproof outer layer for fitted, contour, and prefold diapers. Usually made from polyurethane-laminated cloth (commonly called PUL), cover 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.
Diaper Lab Results:
A collection of covers is always helpful to have around, whether for prefolds on infants or with a big fitted at night with a toddler. You can never go wrong!