Mission Men's VaporActive Performance Crew Socks (2 Pack) 30% Cocona 37.5 Polyester/65% Nylon/5% Spandex Made in US Evaporates sweat and dries ultra-fast Keeps feet cool and dry to maximize peak performance Arch compression for maximum support Strategic cushioning against foot strike areas to reduce impact Traditional crew style Medium (6-8.5); Large (9-11.5)