Imported Pure Cotton Fabric ：Made of 100% cotton, soft and skin friendly, moisture wicking, and breathable, it effectively cares for the tender skin of infants and young children, allowing them to sleep peacefully all night long. Split Leg Design : Our toddler sleep sack designed with split leg,it is 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. Snaps and Double Zipper: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. Size Available - Please refer to our size chart carefully before you order our sleep sack. S is for 6-18 Months, M is for 2-3T, L is for 3-4T,XL is for 405T .