Baby Merlin’s Magic Dream Sack uses the same fabric as the Magic Sleepsuit: cotton inner layer next to the babys skin and cotton exterior layer. Baby Merlin’s Magic Dream Sack is designed to provide your infant with the same cozy feeling that comes from the Magic Sleepsuit, while allowing your baby the freedom of movement they need as they get older.The Dream Sacks roomy sack design has a soft cotton inner layer next to the baby’s skin, and an additionalcotton outer layer for coziness. The two way zipper allows for easy in and out and convenient diaper changes. Baby Merlin’sMagic Dream Sack eliminates the need for loose blankets in the crib consistent with Baby Merlin’s mission to provide a safe and secure sleep environment for babies.