Designed with Baby's Safety in Mind - FILLEEP sleep sack are extensive testing and CPSC-certified, the neckline and hip room with carefully sized for snug fit, prevent your baby from slipping into the sack.And loose leg space ensure the baby to kick and strength comfortably, helping baby's growth and development more Healthy. | Warm and Cozy - Our baby sleep sack boasts a three-layer design, combining a 100% cotton lining with plush fleece fabric, providing super softness and breathability and gentle to baby's skin. Tog 2.5 sleep sack is an ideal choice for cool weather,suitable for autumn & winter, and suitable for room temperatures 61°F- 68°F. | Healthy Growth with Baby -The plush dots surface of sleep sack is soft to touch and has a soothing effect, which helps little one sleep more peacefully. Its sleeveless design maks the baby's activities more flexible and helps regulate temperature, keeping baby cozy without overheating.4 sizes to choose from for growing babies: S(0-6 months), M(6-12 months), L(12-18 months), XL(18-24 months). | Convenient Double Zipper Design - Our wearable blankek for baby features a 2-way zipper for easy diaper changes without disturbing your little one's sleep during night. Zipper cover protectors on top and sides to protect baby's skin without scratch. | Comfort & Long-Lasting- Crafted for lasting quality and can withstand multiple washes, The inner quilting design ensures that the filling is evenly distributed and keep little one's whole body evenly warm., with pre-washing tech to slash shrinkage by 50%, enabling hassle-free machine wash. Warm Tip：Wash and dry on low heat (Less than 30°C/86°F).