Because every baby is unique... and some grow fast (very fast!). Our extenders are designed to extend the life of your cloth diapers by widening the waistband. They simply attach to the diaper's snaps and add a little more room at the hips—perfect for growing baby or for a better fit for certain body types. Practical, simple, and compatible with our OS cloth diaper models. A small addition that makes all the difference. Composition: 94% polyester, 6% spandex