The Nike Vaporfly 4 Proto is the next step in the line of Nike's Iconic Racing shoes. Even Lighter and more Refined, it's Designed to get you Across the Finish line Faster. Whether You're Running 10 km, half Marathon, or Marathon, this shoe is Designed to Maximize your Takeoff and Efficiency. Compared to the Vaporfly 3, the Weight is Further Reduced, and the stack Height is Reduced to 35 mm in the heel and 29 mm in the Forefoot (6 mm drop), Providing Closer Contact with the Ground and more Stability. The Full-length Carbon plate Ensures an Explosive and Propulsion-focused Takeoff. The upper is Updated with an even Lighter and more Breathable Flyknit Material, which wraps the foot with Precise Support where it's Needed. The Tongue has Received even Thinner, Targeted Padding to Minimize Pressure Points from the laces.