This item was used by a child. It's thick and can be used year-round. I'm selling it because my child has outgrown it. Size: S, for newborns to 3-year-olds I bought it, but it was too big for my child, so they wore it to sleep when they were in the lower grades of elementary school. Please refer to the actual size measurements below. Size: Length 66cm x Width 40cm 6-layer gauze sleeper For preventing chills Heat retention Breathability