Darn Tough Function X Over-the-Calf Midweight Cushion Socks Men'sOne of the brand's most tech savy snow socks, the new Darn Tough Function X Over the Calf Midweight Ski and Snowboard Sock for Men 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