Ergobaby's Classic Sleep Bag is an easy to use, wearable blanket that keeps baby cozy and warm without loose blankets, allowing your baby to sleep longer and more peacefully. The Classic Sleep Bag can be worn over additional layers of clothing on cooler nights, and the two-way zipper is amazing for quick diaper changes. Adjustable shoulder snaps make it easy to use, so putting it on is as simple as snap, snap, zip!