On High Socks Women's The ON High socks provice runners with that secret edge on the competition. The high performance crew design also features a built-in arch support that helps create a snug, yet comfortable fit and feel. These socks are perfect for the gym, road runs or during competition. Made with a flat toe seam to reduce irritation. Features a Polygiene®antibacterial treatment. Features a minimalist style fabric with anatomical shaping. Technical mesh sections provide temperature balancing ventilation. Sizing Small: Women's 5-6/Men's 7-8 Medium: Women's 8.5-9.5/Men's 8.5-9.5 Large: Women's 10-11/Men's 10-11 X-Large: Men's 11.5-12.5 US shoe size equivalent.