95% Cotton/5% Spandex Self-Soothing: The Original Woombie is a one-step light, breathable baby swaddle designed with multi-dimensional stretch and a zipper to prevent unraveling; this wearable baby blanket encourages back sleeping and self-soothing; the stretchy but snug fit moves "with" the baby, simulating the feeling of being held, touched, and cuddled Innovative Design: Designed by an RN BSN and nursing team, this ergonomically shaped swaddle blanket is effective and easy to use; we believe that by allowing natural, “womb-like” movement to occur during swaddling, baby’s transition from womb to world will be more effective and appreciated by parents and little ones Comfortable and Lightweight: Our patented swaddle design is made with a 95% cotton/5% spandex fabric to promote gentle airflow; the design is hip and shoulder friendly and the narrowed waistline gently compresses the tummy, providing additional comfort for your baby; seamless interior Quick and Simple Swaddling: No origami required; this easy-to-use, one-step swaddle sack will not unravel as a square blanket can; gently cocoons baby’s arms to keep hands away from face; allows soothing natural arm and leg movement; two-way zipper allows for simple diaper changes to help keep baby comfortable Product Specifications: The Original Woombie is available in 2 sizes to accommodate babies in various stages of growth; swaddle shown is in size Big Baby and is intended to fit babies weighing 14-19lbs.; measures approximately 10 inches across and is 24 inches long; fabric is simple and easy to clean