One of our most tech-heavy snow socks, the new Function X was re-engineered to provide max comfort and warmth for resort skiers and riders. Made from Midweight Merino Wool, these ultra-smooth socks make all the difference if you decide to head back out after lunch. Terry cushioning in the shin and the X on top of the foot provides warmth while added heel durability protects you run after run. | Darn Tough Socks Function X Over-The-Calf Midweight Ski & Snowboard Socks in Black | Size Medium