Liberate NITRO keeps you light on your feet with an effortless ride. Form fit around PUMA's new performance last, Liberate NITRO offers a great fit executed in a sturdy mono-mesh. A one-piece, NITRO midsole delivers just-right cushioning with great responsiveness for tempo runs and competition. To keep you steady and seen, Liberate NITRO has a TPU heel piece providing proprioception, and strategically placed PUMAGRIP for all-surface traction.