The Zen One transitional swaddle and sleep sack perfectly adapts to your baby's needs - designed to help babies self-soothe and get sounder sleep. Features: Mimics your touch for continuous comfort. Two-way zipper for easy diaper changes without waking baby. Removable sleeves allow for arms in or out. Mesh sleeves promote thumb sucking and keep baby dry Inner band provides a secure, snug fit to calm startle reflex. Made from 95% breathable cotton and 5% spandex. The mesh sleeves are 68% nylon and 32% spandex. Contains food-grade polypropylene beads.