Welnove Carbon Fiber Sport Insoles with Arch Support, Shock Absorbing Performance Insoles for High Impact SportWelnove Carbon Fiber Sport Insoles with Arch Support, Shock Absorbing Performance Insoles for High Impact Sport ERGONOMIC CARBON FIBER INSOLES We use innovative technology to shape carbon fiber plates into curved forms, allowing the sport insoles to fit more closely to your feet. When you bend your feet to jump or run, the carbon fiber insole acts like a spring on the bottom of your feet, returning energy and allowing you to run faster and jump