From tough outdoor workouts to dusty back road trail runs, the Darn Tough Power Over-The-Calf Light Cushion Sock provides endurance that goes the distance. The performance of breathable, wicking wool is combined with durable nylon in a fine-gauge knit that keeps the sock in place so there's no slipping, bunching, or blisters. Breathable mesh at the top of the foot wards off clammy discomfort, strategically placed flex windows allow your feet to move naturally, and ribbed lateral ankle padding is there for additional trail support.