100% Cotton HIGH QUALITY MATERIAL: The baby sleeping sack lining is made from velvet that makes a cozy feeling for infant, with the shell also made from cotton. Unique starfish shape design, cute and lovely. The interior soft fleece will keep your baby warm and dry, protecting them from wind and elements to help keep them cozy. DETAILS: With zipper design, easy to put on and off for diaper changes. Baby can stretch out his hand by cuffs; ensures your baby warm and cozy, especially in winter or at night. STARFISH DESIGN: Considering baby likes to kick off blanket at night, Starfish swaddle makes babies?? arms and legs inside the sleeping bag correspondingly. Mummy won??t worry about your little gets cold at night. EFFECTIVE FUNCTION: The sleeping bag works with most strollers, car seats and joggers. Mummy even can use it as an onesie for your little. SIZE: Sleeve 9.05, Length 31.5 (Including the length of the hat), Width 28.7. Fits up to 0-18months baby.