The Cocoon Swaddle Bag is made from GOTS certified organic cotton, and bamboo, with a touch of elastane. This means it's firm enough to restrict startle reflex whilst still allowing stretch and movement for healthy growth. The stretch also allows for full chest expansion when breathing, added comfort, and for a baby to move its hands into a self-settling position inside the swaddle. The soft, breathable organic cotton and bamboo will help prevent overheating during sleep, is certified non-toxic, dyed with water based dyes, and gentle on newborn skin and skin prone to eczema breakouts. A zip enclosure also protects your child's delicate skin, and the two-way zipper makes for quick and easy nappy changes during sleep.