Halo Micro-Fleece SleepSack SwaddleAs a Halo SleepSack Swaddle - Micro-Fleece it replaces loose blankets in the crib that can cover your baby's face and interfere with breathing. In addition to sleeping safer, it helps babies sleep better, too. Its adjustable swaddle wrap immobilizes your baby's arms to prevent the "moro" or startle reflex. And, it's the only adjustable swaddle that allows for swaddling arms in, or arms out for an easy and gentle transition to the SleepSack wearable blanket when it's time to stop swaddling. The Halo SleepSack Swaddle - Micro-Fleece is the only product that carries the gold seals from leading SIDS and safety organizations and is approved as "Hip Healthy" by the International Hip Dysplasia Institute.