Adjustable fasteners for perfect fit Immobilizes arms to prevent startle reflex or scratching Allows for easy diaper changes Micro Fleece, 3.0 TOG Machine washable The only 3-way swaddle that adjusts to fit baby's sleep style. Swaddle with arms in, hands-to-face, or with one or both arms out to ensure baby's best sleep. With adjustable fasteners for a perfect fit, it nestles baby like a soft blanket without the risk of sleep-related dangers - so baby can sleep both comfortably and safely. Signature "Back is Best" embroidery is a gentle reminder to place baby in the recommended sleep position. Features an inverted zipper for easy diaper changes and a roomy sack design that's recognized by the International Hip Dysplasia Institute as promoting healthy hip development.