GEN-Y Classic covers are virtually leak proof and very easy to use. An inner layer of PUL acts as a waterproof barrier, but is soft and flexible. The waist and legs are gathered so nothing escapes your diaper. Our binding is super soft, non wicking jersey for your little one's comfort. Poly-resin snap closures allow air circulation, are more difficult for your baby to undo, and won't snag or wear out with Machine wash/ dry with your other diapers... What's not to love?