cotton & polyester Imported DESIGNED FOR EARLY WALKERS - Our toddler sleep sack with feet is especially suitable for early walkers and toddlers who are more active during sleep. It gives them freedom to move while still maintaining a comfortable and snug sleep environment. With this sleep sack, you will no longer worry about them getting tangled in blankets or tripping over traditional sleep sacks. 2.5 TOG WINTER SLEEP SACK - Our 2.5 tog sleep sack is filled with medium thick polyester fiber that provides enough warmth for cooler nights without causing overheating in warmer weather. A balance between insulation and breathability is key to ensuring baby's comfort throughout the year. Outer and inner lining are 100% premium cotton that is gentle on your baby's delicate skin. UNIQUE CROTCH SNAPS - This toddler sleeping sack has a row of crotch snaps on the crotch that can be fully opened. This feature together with 2-way zipper makes it more convenient for changing diaper. Side Open zipper helps distribute pressure evenly along the baby's body, minimizing discomfort and ensuring a snug yet gentle fit. Widened zipper protectors on the top will protect baby's jaw from scratching BOTH FOR SAFE AND COMFORT - Roomy Fit ensures that the sleep sack provides ample room for baby to move their legs freely, what's more is a consideration of baby's growth and hip development needs. A snug fit around the neck and armholes can help prevent the baby from slipping down into the sleep sack. We take careful consideration of various factors to minimize risks and ensure baby's comfort SIZES AVAILABLE - Please refer to our size chart carefully before you order our sleep sack. Extra Small is for 6-12 Months, Small is for 12-24 Months, Medium is for 24-36 Months, Large is for 36-48 Months. This sleep sack with legs is certified as TOG 2.5, suitable for nursery temperatures 53.6°F- 68°F.The above is only our recommended age, the actual situation may not be accurate, please buy according to your child's actual height and weight. Duomiaomiao Baby Sleep Sack, Winter Cotton Side Open Toddler Sleeping Sack with Feet 2t-3t, 2.5 TOG Quilted Baby Wearable Blanket for Early Walkers. The above is only our recommended age, the actual situation may not be accurate, please buy according to your child's actual height and weight.