Let me begin by addressing the functionality of this sock. This sock does everything you'd hope for. It's comfortable, keeps your feet dry ,and an added bonus is it looks good. Consisting of Coolmax polyester, lycra, etc the sock breathes like a fish underwater. Long gone are the days of your feet swimming in a cesspool of your own sweat, which is nice. In addition to this, it provides more cushion under your feet which is useful especially if you are on your feet all day. It's not much but the difference is noticeable. Lastly, the sizing chart indicates that a size 10 (men) would fit in the L. However, upon sliding the sock onto my foot it dawned on me, primarily because of the excess sock everywhere, that the L would be too large.