Material: Cotton, soft and comfortable Easy to change diapers: An elastic band opening under the sleeping bag for easy diaper change. Generous bag design allows space for kicks Zipper free: Keep your child comfortable with our zipper free design. No more zippers that upset your baby??only soft and gentle comfort Soft and comfortable: High quality cotton, super soft, comfortable, giving a wonderful sleeping state. Replaces loose blankets for a comfortable fit. Cleaning method: Machine wash cold inside out with like colors.