Tipped as the greatest running shoe ever, the adidas Ultra Boost Ltd. utilizes the revolutionary cushioning of boost™'s energy-returning technology - keeping every step charged with an endless supply of light, fast energy. The lightweight and durable STRETCHWEB outsole adapts to the ground for stability from touchdown to push-off. Finished with the shimmering metallic yarn uppers and TORSION® SYSTEM properties for midfoot integrity.