Adidas Adizero Boston 12 (Women's)Adidas Adizero Boston 12 FAST TEMPO TRAINING SHOES WITH HIGH PERFORMANCE TECHNOLOGY. The Boston Marathon is a race. But it's also a goal, and a training plan and all the days it stays on your mind before the big one. The Adizero Boston 12 Shoes are built for mid to long distance running. They bring a race day feel to training with a propulsive feel that comes from the glass fibre infused ENERGYRODS 2. 0, which limit energy loss underfoot. They're