Puma LIBERATE NITRO 2 RUN 75 Puma LIBERATE NITRO 2 RUN 75 men’s running shoes are ideal for fast runs and tempo workouts. The lightweight Nitro foam cushions every step and saves your musculoskeletal system. Push your limits in these Puma shoes with a futuristic design. Puma LIBERATE NITRO 2 RUN 75