This Baby Bunting Sleep sack for Girl is made of pure fleece and it?s super-soft and super-cozy. Mom will love it because its safer than a baby blanket. The bunting fastens with buttons at the shoulders and has a zipper down the side for those midnight diaper changes. The fabric is created of 95% cotton and 5% rayon for a little stretch. It?s lightweight and is perfect for year-round use.