Unique double layer construction provides outstanding comfort with no blisters and no wear-out within 1000 miles of use. Arch brace for extra support. The Fusion Anklet Sock still combines the comfort and protection that comes from a padded sock with the 1000 Mile Double Layer System for reduced friction and blister protection. NEW Ventilation zones for added breathability Padded Achilles tendon protection Arch bracing for additional support and custom fit Padded toe and ball of foot areas for enhanced comfort Knitted to an ankle length for a shorter sock.