Combining effective graduated compression to reduce fatigue with our patented toesock freedom, blister prevention and balance, this is the sock for long races and high-mileage training days. Compression starts at the ankle and continues up the leg to aid circulation and blood flow. The seamless five-toe design eliminates skin-on-skin contact to minimize the friction that can lead to blisters. LYCRA® and strategically placed mesh keep your feet cool and dry, nylon fibers add durability and softness, the cuff stays up, and reflective strips improve low-light visibility.