Signature "Back is Best" embroidery is a gentle reminder to place baby in the recommended Sleep position. Features a 2-way zipper for easy diaper changes Features a roomy sack design that's recognized by the International Hip Dysplasia Institute as promoting healthy hip development. Use over regular sleepwear to take the place of loose blankets 100% cotton; TOG: 0.5 Enchant baby with the magical world of Harry Potter. Limited Edition: Harry Potter Enchanted print. HALO created the first SleepSack over 20 years ago with both safety and comfort in mind. The #1 choice of 1,700 hospitals in the United States, our original wearable blanket with sleeveless design nestles baby like a soft blanket without the risk of Sleep-related dangers.