polyester/cot-ton Imported HIGH QUALITY FABRIC: Our toddler sleep sack are made with high quality fillings that provide extra warmth while remaining breathable and preventing overheating; Made of soft fabrics that are breathable and skin-friendly, keeping your baby cozy and warm all night long. 2-WAY ZIPPER: Split leg design and foot openings make it easy to change diapers at night without removing the sleeping bag. High-quality zippers are smooth and durable to avoid pinching baby's skin and ensure safety during use. U-shape design: The foot openings allow baby to move his/her feet freely while sleeping without feeling uncomfortable due to the constriction. A variety of cute pattern design, so that the sleeping bag is not only practical, but also become a good companion of the baby, increase the fun of sleeping. 2.5TOG WINTER SLEEP SACK : Suitable for children's sleeping bag in winter, spring and fall, suitable for room temperature 60°F - 70°F; Foldable and compressible, easy to carry, perfect for travel and out of the house, so that your baby can enjoy a comfortable sleep anywhere. MULTIPLE SIZES: We offer 4 sizes of baby wearable blanket for kids from 9 months to 7 years old, which are 9-2T, 2T-3T,3T-5T,5T-7T.We have indicated the size of each size of the sleeping bag in the picture, and we also recommend the corresponding height for the kids. Please measure your child's height from ankle to shoulder to choose the most suitable sleep sack with legs size for your baby. 2.5tog toddler sleep sack walker