I was hesitant to buy this at first because only one leg opens with a zipper, and I was worried it would be difficult to put on. In the end, since it was cheap, I bought it as a back-up for when everything else is dirty. I was very pleasantly surprised to find that, actually, this sleeper is really easy to put on, much faster than sleepers that have buttons on. So from a back-up item, this has turned into something Baby Girl wears every day. The material is thinner and more breathable than other sleepers I've bought. I think the baby likes it better than the thicker ones. One drawback to the zipper is that, to change a diaper, you have to open the entire top part as well. You can keep the top part closed if the sleeper fastens with buttons. But I think the speed with which you can put this on more than makes up for this small drawback.