The Woombie Convertible Baby Swaddle helps moms swaddle the way nature intended. This wearable blanket is ergonomically shaped with a 'hip healthy' design and and arms-free interior encouraging self-soothing in the Hands Over Heart recommended sleep position. Mild compression mimics the sensation of touch and two way zipper prevents unraveling throughout the night. The cotton/spandex blend fabric is light, breathable and provides a multi-dimensional stretch. Arms open to convert the swaddle to an arms-free sleeper, allowing two options to do what's most comfortable for your baby. Dress baby accordingly underneath depending upon season and nursery temperature.