Fits Ultra-Light no-show runner gives you the lightest and lowest fit. Designed for the support and protection you need.Our patented Full Contact FitA(R) hugs the contours of your foot and stays put - ensuring loose socks will not rub you the wrong way.Flat knit design for zero bulk.Fully vented top for maximum breathability.No-show height that will not fall down into your shoe.No cushioning in the footbed.Sizing: S(5-7) M(7.5-9.5) L(10-11.5)73% Merino Wool, 21% Nylon, 4% Polyester, 2% LYCRAA(R) Spandex