Adidas Adizero Boston 5 running shoe features Boost technology, with energy-returning properties that keep every step charged with an endless supply of light and fast energy. Clover-shaped Coolever mesh upper for heat and sweat management and increased performance. Synthetic and environmentally responsible, solvent free synthetic Tirrenina suede overlays. Extended Torsion System for energy return in the forefoot and natural integrity in the midfoot. Molded responsive EVA sockliner for anatomical fit and great step-in comfort. QuickStrike outsole decreases weight and increases flexibility and durability. Continental Rubber for superior grip in all conditions.