The Mil-Spec Sport Sock shares specifications with U.S. Military socks: they're built with anti-microbial silver filament yarn. The silver knit into the heel, toe and sole is proven to kill bacteria and promote moisture migration. The silver is game-changing. These socks are tough.  

American Trench made a slight change to their "Mil-Spec" design, adding a compression band on the foot for additional performance, comfort, and arch support. 

• USA grown and spun cotton with real silver
• 68% Cotton + 24% Nylon + 4% Spandex + 4% Anti-microbial Silver
• One size (US men's 8.5-13), stretches over the calf, stays firm on the leg
• Machine wash, tumble dry