100% Cotton Zipper closure 100% natrual cotton inside, cozy warm cotton velvet on shell with super soft SIZE: please measure your baby from head to toe and match the length of your baby with the corresponding size according to our sizing chart, thare are 4 size from 3-40M,S: Baby between 22-31??3-9 Months; M: Baby between 26-34??6-18 Months; L: Baby between 31-39??15-30 Months; XL: Baby between 36-44??24-40 Months TOG 2.0: All year around use, much suitable for mid-season and room temperature from 18-24??(64-76?H) in heat and air condition. HIGH QUALITY:premium quality on fabric in OEKO Class 1 Standard, soft and comfortable natural cotton jersey inside, warm and cosy cotton velvet on shell, baby will like this touching. Good quality on YCC ZIPPER and Snap. SAFE for BABY:The zipper’s internal protective sheet can prevent the baby from being pulled, and will not rub baby’s skin, super soft and safe for baby. Neck Collar size made strictly bas on BS EN 16781.