Reebok KFS Pump Advantage White Womens Tennis Shoes Synthetic This trainer is equipped with technology that ensures a high performance, well-rounded tennis shoe KineticFit System (KFS) upper provides comfort, support and flexibility to key areas of the foot DMX Foam enhanced cushioning technology for superior comfort PlayDry lining to provide the ultimate in support, breathability and moisture management in hot condititons Reebok Pump technology in the tongue provides a custom, adjustable fit