Engineered for faster performance than ever before, the impressive Race VECTR Sock is designed with 2XU's X:LOCK support system powered by 2XU's Compression technology for a secure, ergonomic fit to the foot and stabilization of the ankle and arch. It delivers maximum chafe protection and extra cushioning in the heel and forefoot. Dry mesh panels provide ventilation and the linked toe cage increases comfort. Ideal for racing and training alike. Features: - X:LOCK support system - X:BLEND fiber formula: nylon - Linked toe helps prevent blisters - Moisture wicking fabric - Dry mesh panels for ventilation - Cushioned heel and forefoot Sizing: - S: US Women's Sizes 4 - 6.5 - M: US Women's Sizes 7 - 9.5 - L: US Women's Sizes 10 - 13