Model [ NK11467139]Nike Free Trainer V7 Training Shoes Cool Grey/Black/White/Hyper CrimsonFlexible Movement. Stable Stance.The ultralight Nike Free Trainer V7 Men's Training Shoe delivers the stability and versatility you need for high-intensity workouts-and adds the incredible flexibility of a Nike Free sole. Natural MovementWith each step, the updated Nike Free sole expands and contracts in all directions, following the natural motion of your foot. Targeted StabilityA 3D-printing-enhanced upper provides targeted areas of durability, breathability and stability right where you need them. Secure FitA half-sleeve design with Flywire cables and stretch bands provides a locked-in fit during intense workouts-while still providing easy on and off. More DetailsNo-sew overlays for durability. Heel counter helps improve stability. One-piece foam sole is comfortable and extremely lightweight. Foam insole follows the curve of your foot. Rubber sections at the toe and heel provide durable traction Nike Free OriginsAfter learning that Stanford athletes had been training barefoot, three of Nike's most innovative and creative employees set out to develop a shoe that felt natural and weightless, similar to bare feet. The team spent four years studying the biomechanics of runners' feet in motion. The results yielded a profound understanding of the foot's natural landing angle, pressure and toe position, allowing Nike designers to build an unconventional and flexible running shoe from the inside out.