Cocoon Swaddle Bags are designed to be both easy to use and difficult to escape from. This zip-up swaddle is TOG rated for warmth, keeping baby snug and securely swaddled without the need for additional blankets. The 2.5 TOG rating is ideal for room temperatures 61-71?? F (without the need for extra blankets). Parents can layer up underneath as needed, and follow the handy room thermometer/what to wear guide included with the product. The Cocoon Swaddle Bag is made with GOTS-certified organic cotton with a of touch elastane. It's firm enough to restrict the startle reflex, while still allowing stretch and movement for healthy growth. The stretch also allows for full chest expansion and allows baby to move their hands into a self-settling position inside the swaddle. Handy arm poppers transition the Cocoon from an arms-in swaddle to arms-out sleeping bag when baby is showing signs of rolling. The bell shaped design is approved by the International Hip Dysplasia Institute as being hip-healthy, and promotes proper joint development. The soft, breathable organic cotton is certified non-toxic, dyed with water-based dyes and gentle on skin prone to eczema.