Our tallest, lightest-weight socks for climbing and trekking in an alpine environment. The combination of Capilene® polyester inside with nylon outside speeds moisture transport and increases durability; a touch of spandex keeps the fit snug. Vertical channels over the foot dissipate heat, and the innovative, rib-cuff design is nonrestrictive and prevents socks from sloughing into boots. Excels as both a liner sock for extra warmth in cold conditions, or alone in hot and humid weather.