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Fuel your fitness fire at HolabirdSports.com! The new AdiZero Boston 8 returns to give runners a reliable, race-day shoe made for long distances. The ultra-responsive Boost technology continues to provide the absolute best in cushioning and feedback that runners have known and loved for years. A stability rail adds lightweight guidance that runners will appreciate but wont interfere with their performance. Upper: An engineered mesh upper offers lightweight and breathable support. Midsole: A stability rail and the midfoot TORSION® SYSTEM provide stability and propulsion throughout the midfoot phase of the gait cycle. A Boost™ midsole provides unmatched energy return and superior cushioning. Outsole: Continental Rubber on the forefoot outsole delivers 21% more traction in dry conditions and 23% more traction in wet conditions. Features a flexible, STRETCHWEB outsole that flexes more naturally..