Instep protection protects it from lace blows and other possible irritations. Internal anti-slip silicone strips on the back of the heel help prevent socks from slipping. The material wicks away sweat and dries very quickly. Medium suspension at the front of the foot for all-day comfort. Mesh panels for better breathability. Built-in arch support helps reduce leg fatigue. A customized heel wraps around your foot for a better fit.