This is a boys' XL size. I think it's about the same as a men's S size, so I listed it as a size S. I've measured it with a tape measure, so please use that as a reference. I bought this at a department store in Japan several years ago. The Polo Bear wearing the big pony is popular, and the XL size in particular sold out quickly. I don't think I've worn it many times, so I don't think the color fading typical of navy blue will be noticeable, but this is just my subjective opinion and it's a used item, so please refrain from purchasing if you are sensitive or concerned about minor details.