K-Swiss Hypercourt Express 2 Clay Men's Tennis Shoe K-Swiss best-selling shoe, the Hypercourt Express 2, is light, comfortable, breathable, and has a generous fit, making it the ideal choice for a variety of playing styles and levels. Durawrap Flex, gives the shoe support with no break-in period, while Surgelite midsole technology provides all-day comfort. The shoe also features a deep grooved herringbone outsole for exceptional traction on clay court surfaces.