The new and improved Adizero Boston 6 provides the undeniable lightweight, responsive cushioning that runners have come to enjoy over the years. The Boost™ technology provides the ultimate energy return on training and race day. An updated outsole gives runners a smooth transition with the same superior traction and durability from a Continental Rubber. Upper: A knit mesh at the forefoot provides breathable flexibility and improved fit. Omori micro-fit standards provide the ultimate fit and feel. Flat laces reduce irritation.Midsole: Coolever mesh lining allows for superior moisture and heat exchange between the foot and the outside air. Midfoot TORSION® SYSTEM provides stability and propulsion throughout the midfoot phase of the gait cycle. A midsole of 55% Boost™ provides unmatched energy return and superior cushioning.Outsole: adiWEAR™ heel outsole provides superior grip and durability while maintaining light weight. Continental Rubber on the forefoot outsole delivers 21% more traction in dry conditions and 23% more traction in wet conditions.