The multi-layer sleeping bag is ideal for the transitional period thanks to the four layers and gives your baby the feeling of safety and security when you switch from the puck sling to the sleeping bag. This baby sleeping bag can simply be pulled over the pajamas and replaces loose blankets in the crib - for a safe night's sleep. The sleeping bag allows air to circulate and reduces the risk of overheating for your baby, so you and your baby can sleep peacefully. The convenient zipper opens from the bottom for easy nighttime swaddling. 1.5 TOG: Perfect for medium room temperatures (20 to 22 °C). Machine washable: Remains soft after every wash. All aden + anais materials are made without azo dyes. All aden + anais packaging is recyclable and meets the requirements of the "Green Dot Initiative".