Size M... Head circumference 47~ cm (12-18 months old) This is a pixie bonnet made with fluffy, brushed fabric. I am selling it because my child didn't like hats and couldn't wear it. The fluffy material is cute, but you might be worried about the brushed texture if your child has sensitive skin. But you want them to wear a winter bonnet! This bonnet is highly recommended for such children. The outer fabric has a cute, bumpy surface that is less prone to shedding compared to regular brushed fabrics. The material is 100% cotton, which is unusual for fluffy fabrics. The lining is made of smooth, 100% cotton rib knit fabric, so the part that touches the skin is smooth, making it comfortable for sensitive skin. The ties are also 100% cotton. All parts that touch the skin are made of smooth rib knit fabric, the same material used for underwear, so you can wear it with peace of mind. The fabric is stretchy, so it's easy to wear even if your child is older than the target age range. It's also thick and can cover the ears, making it effective for cold protection.