Pure Boost X Training ShoesThe boostâ„¢ midsole on these women's training shoes is a game-changing material that has altered the athletic world with its ability to recycle an endless supply of light, fast energy. This pair gently hugs feet with sock-like arch support, a lightweight, women's-specific frame, and a premium mesh and synthetic upper. A pivot-point rubber outsole offers smooth rotational moves. A gap in the overlay at the arch supports the natural movement of your foot and creates a streamlined look.boost™'s energy-returning properties keep every step charged with an endless supply of light, fast energyMesh, textile and synthetic upperSock-like arch support for a comfortable foot-hugging fitArch gap supports the foot's natural movementPivot-point rubber outsole for easier rotationImported