【100% Cotton Surface】Sleep sack long sleeve is 100% cotton inner and outer layers, which makes the miracle baby sleep bag super soft, cozy and breathable. No harsh chemicals or dangerous dyes are used, meaning this toddler sleeping bag is safe and gentle on your little one's sensitive skin. 【Safety Zipper&Snap Design】 The zip from bottom up feature of our baby wearable blanket is super practical to help parents quickly pop the bag onto a wriggly baby and is great for a diaper changing time too.Toddler sleeping sack comes with zipper protection to protect the baby from scratch. 【Available Size】 Available in 3 sizes for babies 0-18 months (S, M, L), you can choose the suitable size for your baby. Please pay attention to the size chart shown in the pictures to get the best size. Available in a variety of adorable cute patterns for boys, girls and unisex options. 【Sleep and Play Freely】 The hem of newborn sleep sacks long sleeve is scientifically widened, suitable for the baby's natural frog-legged position and is beneficial for your baby's hip development. It can be kicked freely, making it more comfortable for the baby to turn over. The roomy room allows plenty of room for kicks, but not kicks out of the way - keeping baby warm and safe all night long. Best for babies. 【EASY TO CARE】Our baby sleeping bags are super easy to keep clean. Simply place your baby's favorite detergent in the washing machine and air dry or tumble dry on low. We offer a 101% satisfaction guarantee because we know you and your little one will love our baby wearable blanket. Product name: Miracle Baby Sleep Bag Long Sleeve Perfect for all seasons, this wearable blanket long sleeve is crafted from premium materials to keep your baby warm without overheating. Key Features: Premium 100% Cotton: Soft, breathable, and gentle on sensitive skin, our sleep sack is made from high-quality cotton.