Open box new no tags so I have to list as used Product Details The FuelCell SuperComp Trainer brings the seconds count performance of energy-return technology from race day to a high milage training shoe. In this execution of new Energy Arc technology, a stacked height midsole houses an arched carbon fiber plate, 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. The FuelCell SuperComp Trainer is designed to look, feel, and perform differently. - Features Energy Arc: Energy Arc pairs sport-specific carbon fiber plate geometry with strategic midsole voids, designed to increase stored energy to deliver a higher amount of total energy returned - FuelCell foam delivers a propulsive feel to help drive you forward - 47mm midsole height - Breathable, flat knit upper with lock-in fit feeling - ‘N’ logo design wraps around to lateral side of shoe - 320 grams (11.3 oz)