EZ Diaper Changes with WONDERZiP: Innovative full-length zipper system makes nighttime diaper changes simple—baby stays warm, covered, and calm while you zip and go. Double zip pull covers help keep baby safe and comfortable. Non-Weighted for Safer Sleep: Designed in accordance with AAP and CPSC guidelines, our sleep sack is not weighted, making it a safer alternative for infants. The gentle design supports healthy sleep without adding pressure to baby’s body. Comfortable Fit + Natural Positioning: Wider and longer shape allows your baby to sleep in a natural “froggy” leg position, supporting hip development while providing room to grow and kick freely during naps or overnight sleep. Year-Round TOG Options: Choose from 0.5, 1.0, or 2.5 TOG sleep sacks to suit your room temperature. Premium hypoallergenic down-alternative fill in the 1.0 and 2.5 TOG adds warmth without weight, while 0.5 TOG is perfect for warmer nights. Silky Soft & Safe for Skin: Made from a rayon blend and certified OEKO-TEX Standard 100, this sleep sack is gentle on sensitive skin. Free from flame retardants, toxins, and irritants. Rigorously tested to meet or exceed U.S. and Canadian safety standards. Wrap your little one in cloud-like comfort with this ultra-soft rayon baby sleep sack. Filled with hypoallergenic down-alternative microfiber, it offers breathable warmth without overheating. Designed with our genius WONDERZiP for quick diaper changes and a wider fit for easy movement, this non-weighted wearable blanket keeps baby cozy, calm, and safely covered all night.