New Balance brings the race day feeling of energy-return technology to a high milage training shoe. The new FuelCell SuperComp Trainer v2 is designed to look, feel, and perform differently. In this execution of new Energy Arc technology, an arched carbon fiber plate is sandwiched between two layers of FuelCell cushioning, leaving a hollow channel through the middle of the shoe. The plate is flattened into the void with each foot strike, and returns energy as it reshapes, creating a high rebound sense of propulsion.