HALO® created the first SleepSack® over 20 years ago with both safety and comfort in mind. The #1 choice of 1,700 hospitals nationwide, our original wearable blanket with sleeveless design nestles baby like a soft blanket without the risk of sleep-related dangers. 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. TOG: 1.5 Ideal for temperatures 68 - 72° F