Thank you for viewing. I bought this last year thinking I'd need it when I was outside for long periods in the cold, but I never used it and my child outgrew it, so I'm selling it. As shown in the second photo, you can wrap the baby by bending their hands and feet, which prevents wind from entering and keeps them warm, so I recommend it. The size is 50-70, but I think it feels a little bigger than that.