This sleep sack wearable blanket is designed for warmer nights to keep baby at a comfortable temperature to sleep through the night. Thoughtfully designed with safe sleep in mind, the Boppy Sleep Sack Wearable Blanket has all the features needed so you and baby can rest easy. Provides comfort for baby and peace of mind for you. Features a two-way zipper for easy nighttime diaper changes and a zipper guard to protect baby’s neck from any potential scratches. The sleeveless design made with 100% cotton jersey fabric helps avoid overheating and is daycare approved for nap time. For proper fit, ensure baby meets all sizing guidelines. AAP Safe Sleep Recommendations: AAP recommends all babies sleep on their back, on a flat, firm, separate sleep surface such as a bassinet, keeping the baby's sleep space free from blankets, bumpers, nursing supports, toys or other objects. In place of blankets, wearable blankets are recommended to keep baby at a comfortable temperature. What Is a TOG Rating? TOG, or Thermal Overall Grade, measures the thermal insulation of a product and is used to help you determine how to keep baby at a comfortable temperature. For baby sleepwear, TOG ratings correspond to the temperature of the sleep space.