ULTRA-SOFT AND BREATHABLE: Made with high-quality combed cotton, our wearable blanket is soft, cozy, and gentle on your baby's delicate skin. The breathable fabric ensures your little one stays comfortable all night long | 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 | EASY DIAPER CHANGE: The baby sleeper sack adopt double zipper for easy diaper changes and on-off, zipper protection to prevent scratches | TWO SIZES TO CHOOSE FROM: Our sleeping sack comes in two sizes to fit babies from 0-18 months. Size S is perfect for babies 0-6 months, while size L is ideal for babies 6-18 months | WHAT YOU GET: Removeable long sleeves baby sleep sack, great customer service. Machine washable. If you have any questions, please free to contacct us