Xelero X-GPS Running Shoe (Women) - Silver Grey/Sky BlueThe Xelero X GPS provides unparalleled support and functionality. The enhanced Xelero technology incorporates a Guidance Propulsion System. The Propulsion element cradles the rear foot and extends forward to guide the foot into a neutral position thought the gait cycle. The carbon fiber Slingshot plate provides torsional stability, keeping the foot in alignment, and helps to reduce impact pressure. The dual layer X Lite midsole provides cushioning,