The boston marathon is a race.; But it's also a goal, and a training plan, and it stays on your mind all day before the big one.; The adizero boston 12 shoes are built for mid-to-long-distance running.; They bring a race-day sensation to train with a propulsive sensation derived from the glass fiber infused energyrods 2.0, which limits energy loss underfoot.; They are fast, but that does not cost durability - the midsole layers ultra-light lightstrike pro cushioning with a new version of durable lightstrike 2.0 eva.