Baby Merlin's Magic Dream Sack Walker uses the same fabric as the Magic Sleepsuit: cotton inner layer next to the baby’s 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 Sack’s roomy sack design has a soft cotton inner layer next to the baby's skin, and an additional cotton outer layer for coziness. The two way zipper allows for easy in and out and convenient diaper changes and foot openings to allow your older baby more mobility. Baby Merlin's Magic 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.