HALO SleepSack Early Walker: Helps babies and toddlers sleep safe and sound. The HALO SleepSack Early Walker replaces loose blankets in the crib that can cover your babys face and interfere with breathing. With its unique foot openings, the SleepSack Early Walker wearable blanket allows for greater mobility while babies are awake, but also keeps little feet covered and warm while sleeping. In addition to helping your baby sleep safer, the HALO SleepSack wearable blanket helps your baby or toddler sleep better, too. It is a warm cuddly blanket they cannot kick off; ensuring little ones sleep soundly throughout the night. The HALO SleepSack wearable blanket becomes the trusted bedtime routine, providing the secure feeling he needs to fall asleep fast and sleep soundly throughout the night. Used in hospital nurseries nationwide, the Halo SleepSack wearable blanket is the #1 choice of hospital nurseries. HALO also proudly supports non-profit organizations like First Candle/SIDS Alliance. Use over regular sleepwear to take the place of loose blankets. 100% polyester micro-fleece. TOG: 1.0. Meets federal regulations for childrens sleepwear. Size medium fits 16-24 lbs; size large fits 22-28 lbs; size extra large fits 26-26 lbs.