This is the sock for long runs and aggressive hikes on rugged terrain. The crew length rides high to seal out debris, and a band under the arch adds support. COOLMAXA(R) fibers and a mesh top keep feet dry and cool, nylon fibers add durability, and midweight cushioning protects your feet. Features Arch support Blister prevention Moisture management Total foot utilization Mesh top Fiber Content: 39% CoolMax EcoMadeA(R) 58% Nylon 3% LycraA(R)