A high-performance shoe for medium and long-distance runs from running, designed in part from recycled materials. The Boston Marathon is a race. But it's also a goal, a training program and days of preparation. The Adizero Boston 12 shoe is designed for medium- to long-distance runs. It gives you a taste of competition in training, thanks to ENERGYRODS 2.0 fiberglass shanks that limit energy loss underfoot. It guarantees maximum speed, but that doesn't detract from its durability: the midsole combines Lightstrike Pro ultra lightweight cushioning with a new version of Lightstrike 2.0 robust EVA.