Before it's first use, the Snappi has to be very well stretched to double its size. It is best to hold Snappi in your hands, and stretch it gently at first, and then more and more as it gives with each stretch. Then hold the two long legs securely in one hand and stretch the third leg. The elasticity will improve with each stretch while the unique material will return to pretty much its original size after you let it go. 

Lay out diaper, wide in the back, narrow at the front.

Place baby on diaper, bring diaper up through baby's legs. Fold diaper over (you can do this in the front or back) if diaper is too long.

Hook the Snappi on the left back corner of the diaper.

Stretch the Snappi to about double its length over to the right side and hook the right back corner of the diaper.

Stretch the middle hook of the Snappi down and fasten for a snug fit. It should look like a 'Y'

Ready for a diaper cover!