Firstly it has a very long zip (1m +) all around that allows it to open out in half for ease of access. When it's fully open it looks like a butterfly. This is perfect for putting babies to sleep with less chance of disturbing them when you zip them up. It's also great for keeping babies in if you need to pick them up in one swoop if they are crying for example, and the zipper also means it's fast to open. We use sturdy poppers at the shoulders to fasten. Make great baby presents personalised with the baby's name, on the front like sleeping bags for babies. They are great fun and mums and dads will be very happy too with their practical use. A baby gift idea that does a good job is always a welcome present for new parents.