FLAT SOCKS create a moisture-wicking barrier that saves your shoes from becoming a stinky swamp! Get the feel of a soft wool sock while freeing your feet and going sockless. These Dark Heather Grey FLAT SOCKS are the real deal. They feel as good as they look; soft, cozy, cushy, giving a much more natural feel underfoot. If you come from a heritage of softer socks and want the same feel as you go sock-free, these are your FLAT SOCKS. Sizing: These socks are trim-to-fit. The Large size fits up to men's size 13. If possible, remove the shoe’s insole and use it as a guide for trimming your FLAT SOCKS. Replace shoe insole when finished. If your shoe’s insole is glued in or difficult to remove, use trim guides stamped into the underside of FLAT SOCKS to trim to the right size.