Woombie Air Baby Swaddle - Twilight (Gray) 14-19 lbs. is a light, breathable and easy swaddle to use. Swaddling a baby recreates the feeling the baby felt in the womb, comfort and calm, and is one of the first things that the nurse in the hospital does -- swaddle the baby. This product is made of 95% cotton and 5% spandex. One-step swaddling is easily accomplished when using this patented baby swaddle design with a multi-dimensional stretch and zipper to prevent unraveling throughout the night. Its four-season vented design allows the perfect amount of airflow during swaddling.