Adizero Boston 12 M ADIZERO BOSTON 12 M Size 25.5 High-performance running shoes for long-distance races and training, featuring thick soles and high rebound. For marathons and long runs aiming for personal bests. A high-performance model equipped with high-rebound propulsion technology that brings speed to both races and training, utilizing repulsion and assistance. ENERGYRODS 2.0, made with glass fiber, generates propulsion, bringing the feeling of race day to training and reducing energy loss in the soles of the feet. There is no compromise on speed or durability. The midsole combines incredibly lightweight LIGHTSTRIKE PRO cushioning with durable LIGHTSTRIKE 2.0 EVA. Approximately 50km of running. Shoe key is not included.