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Maintaining a lightweight and springy design, the adidas adizero Boston 9 continues to be a great race day or workout option.What's NewImproved fitBuilt on the same platform as its predecessor that's wider under your arch, the adidas adizero Boston 9 retains its dialed-in fit and a smooth ride. To assist you in picking up the pace, this shoe kept the torsion system in the midfoot that's designed to act as a spring just as you toe-off. Finished with a new lightweight and breathable mesh upper, the Boston 9 will disappear on your feet when the pace reaches supersonic speeds.