Adidas Ultra Boost m Prime knit upper adapts to the changing shape of your foot through the gait cycle, and a supportive cage secures a locked-down fit. Adidas Prime knit upper wraps the foot in adaptive support and ultralight comfort boost is our most responsive cushioning ever. The more energy you give, the more you get STRETCH WEB rubber outsole flexes underfoot for an energized ride TORSION SYSTEM between the heel and forefoot for a stable ride, FIT COUNTER molded heel counter provides a natural fit that allows optimal movement of the Achilles, continental. Rubber outsole for extraordinary grip in wet and dry conditions.