DETAILS Anatomically shaped with an ultralight, minimal design for gentle support Won't bunch, crinkle, or slip -- stays in place throughout run Technical mesh panels ventilate to keep foot temperature in perfect balance Seamless construction -- you'll barely notice you're wearing socks SIZING XS:   American shoe sizes 5-6 Small:   American shoe sizes 7-8 Medium:   American shoe sizes 8.5-9.5 Large:   American shoe sizes 10-11