K-Swiss Vertical Tubes Recover Running Shoe - Black/Charcoal synthetic Sizing: 3 Men/5 Women, 4 Men/6 Women, 5 Men/7 Women, 6 Men/8 Women, 7 Men/9 Women, 8 Men/10 Women, 9 Men/11 Women, 10 Men/12 Women Special formula EVA to provide maximized cushioning and enhance durability of the midsole. Cushioning provided by regionally specific Tubes technology. FKS00207