The 1000 Mile Fusion Anklet Sock combines comfort and protection with the 1000 Mile Double Layer System to reduce friction and prevent blisters. It features extended padding on the heel and around the ankle, plus re-shaped padding on the toe and ball of foot areas for enhanced comfort. Ventilation zones on the top of the foot increase breathability, keeping feet cool. This sock is knitted to an ankle length. Features: NEW Ventilation zones for added breathability, Padded Achilles tendon protection, Arch bracing for additional support and a custom fit, Padded zones for comfort and protection.