The Brooks PureFlow 2 running shoe has a BioMoGo DNA midsole that features earth friendly midsole technology blended with Brooks DNA smart cushioning to tune cushion and response based on the needs of each and every runner. IDEAL Heel encourages contact points to shift forward, which aligns the joints and creates optimal energy return. Split toe enhances forefoot flexibility and independently empowers the big toe to engage the runner's natural stability and a powerful push-off. Nav Band wraps over the instep and provides a comfortable, assured fit regardless of foot shape. Anatomical Last was designed from an anatomical form so the shoe's shape contours the foot to provide true support and a glove-like feel. Wt. 8.8 oz.