Powered by 2XU Compression technology, the Winter Long Range VECTR Sock features 2XU's X:LOCK support system for a secure, ergonomic fit to the foot in order to prevent abrasion while optimizing footstrike and push off technique. Employing 2XU's X:BLEND fiber formula, industry leading merino yarns provide outstanding thermoregulation and moisture management. Ideal for endurance running and multisport events in cool conditions. Features: - X:LOCK Compression Technology to optimize footstrike and push off, while also preventing abrasion injuries - Dry mesh panels for ventilation and moisture management - X:BLEND fiber formula - Linked toe + anti-blister technology - Propulsion pad that cushions forefoot impact - Antimicrobial fabric Sizing: - S: US Women's Sizes 4 - 6.5 - M: US Women's Sizes 7 - 9.5 - L: US Women's Sizes 10 - 13