The Vectr Cushion Full Length sock is anatomically designed to optimally support the plantar fascia and arch of the foot. It relies on the unique X-Lock support system to hold the foot in place and prevent blisters, so you can walk more comfortably than ever before. Graduated compression for better circulation. Zoned mesh ventilation for improved breathability. Graduated compression Increases blood flow to muscles, improving performance, reducing the risk of injury and speeding recovery. X-Lock technology supports the arch and plantar fascia and keeps the foot in the sock to prevent blisters. Anatomical design Designed to match the structure of the left and right foot for a better fit. The wide, seamless toe box prevents toe irritation and promotes natural toe splay for better balance, alignment and comfort. Moisture-wicking yarns and mesh ventilation zones keep your feet cool and dry. L1 = 42/46. calf circumference = 36/40 cm.