CLEAN SUGGESTION: Removable long sleeves baby sleep sack can be hand-washed or machine-washed. Hand-washing is recommended to ensure the service life of the product. When machine washing, pay attention to choose the gentle mode, the water temperature is not higher than 40?, close the zipper or put it into the laundry bag before washing. Cannot be bleached, ironed, or dry cleaned. THREE SIZES TO CHOOSE FROM: Our sleeping sack comes in three sizes to fit babies from 3-30 months. M: Length: 70 cm, suitable height 55-70 cm, suitable for baby 3-7 months; L: Length 80 cm, suitable height 65-80 cm, suitable for baby 7-18 months; XL: Length 100 cm, suitable height 90-105 cm, suitable for baby 18-30 months. Please choose the correct size according to your baby's height. EASY DIAPER CHANGE: The design of the two-way zipper, baby sleeping bags have an easy zip opening that’s perfect for night-time nappy changes, meaning you can unzip from the bottom for a quick-change keeping disturbance to a minimum, zipper protection to prevent scratches. REMOVEABLE SLEEVES: It can be used as both a long-sleeve sleeping bag and a sleeveless sleeping bag. Keep baby's arms warm when there are sleeves. When you don't need the sleeves, they can be removed to keep baby's underarm air flowing. ULTRA-SOFT AND BREATHABLE: 3.5 TOG Baby Sleeping bag is designed using soft fabric Made with 100% cotton and lined with 100% pure cotton - perfect for sensitive skin. The filling is made from quick dry soft polyester, which helps to prevent allergies and stops the sleeping sack losing shape and becoming lumpy. The breathable fabric ensures your little one stays comfortable all night long. Machine Wash. Zipper Closure. 100% Cotton.