aden + anais Muslin Sleep Sack is a wearable blanket made of lightweight, breathable muslin cotton, designed to be a safe alternative to loose blankets in a baby's crib. These sleep sacks feature a sleeveless design and a bottom-up zipper for easy diaper changes while keeping the top part of the baby warm. The muslin fabric is known for getting softer with each wash, and the open weave helps regulate the baby's temperature, reducing the risk of overheating. Key Features Material: Made from soft, breathable 100% organic cotton muslin. Safety: Eliminates the hazard of loose blankets in the crib. Functionality: Bottom-zipping design allows for easy nighttime diaper changes. Breathability: The open weave of the muslin allows for airflow, helping to prevent overheating. Comfort: The fabric becomes softer and maintains its shape after multiple washes. Design: A generous sack design provides room for kicking while keeping the baby warm and secure