adidas Performance Men's Ultraboost Atr M Running Shoe 100% Textile and Synthetic Imported Rubber sole boost's energy-returning properties keep every step charged with an endless supply of light, fast energy STRETCHWEB rubber outsole is lightweight and elastic, adapting to the ground for stability and working strategically to optimize the unique properties of boost from touchdown to push-off adidas Prime knit is carefully engineered to naturally expand with your foot while you run to give you a more comfortable fit TORSION SYSTEM for midfoot integrity; A supportive cage wraps around the midfoot for a locked-down fit Continental Rubber outsole for extraordinary grip in wet and dry conditions