The Snappi® is a safer, more reliable, EASY to use fastener for cloth diapers that replaces the nasty diaper pins. The stretchable non-toxic Snappi® hooks into the diaper material to make a strong closure. They work best with diapers that have a loose enough weave for the Snappi® to hook into. (Snappi® terry cloth diapers, cotton pre-folds, and others) Note they do not work well with flannel or other tightly woven diapers. How to use your Snappi®: To improve elasticity, stretch your Snappi® fastener a few times before use. Step 1: Hook left Step 2: Stretch across and hook right Step 3: Stretch down and hook center The Snappi® should go from a "T" shape to a "Y" shape when stretched properly. Warning: Always use a cover over a Snappi fastener.