With Graduated Compression engineering to promote increased circulation, the 2XU Race Sock enhances blood flow and supports and stabilizes the calf and key muscles in the lower leg during training and competition to allow these muscles to operate more efficiently with more power and less fatigue. The race sock also promotes increased circulation to flush by-products more efficiently and minimise blood pooling in the extremities. This popular sock also channels air, wicks moisture and boasts a linked toe cage to enhance comfort during use. Perfect for endurance events.