Lift. Run. Move. In the Nike® Flex Train shoe, you have the freedom to choose your own workout adventure. Its all-purpose attributes unlock a wealth of training options, thanks to a flexible outsole and lightweight upper. The rubber outsole comes with built-in cutouts for flexibility. And there are thin slits in the forefoot for added flexibility. The upper is made of mesh for lightweight, breathable support. The mesh collar gives you soft comfort around your ankle.