brand new in box with tags never worn or even tried on. size 12. Strike and bounce on your forefoot, engage more muscle groups while running, run better by improving your stride and cadence, and increase your heart rate over a shorter distance and period by shifting the momentum and impact from your joints onto your muscles while running = ULTIMATE SUPER TRAINERS. The MUSCLE RUN™ shoe from the line of Muscle Running™ footwear facilitates proper running form by shifting the impact from your ankles, knees and lower back onto your leg muscles, and thereby help strengthen your legs' underutilized muscle groups and additionally improve balance, agility and responsiveness.