Just like the Brooks core line, the PureProject series is held to the industry highest wear-test and durability standards. Because of their lightweight construction and fewer materials, runners should generally expect shoes from the PureProject line to last approximately 250-300 miles. The lightweight construction and lush cushioning of the PureFlow 4 are a perfect match for each other. The Nav Band is a flexible band that wraps over the instep to comfortably secure the foot in place. The dynamic stretch provides just the right amount of support and can accommodate different foot shapes with a comfortable, assured midsole fit. A curvature in the heel shifts the contact point forward so the runner lands with more ground clearance under the middle of the heel. This aligns the joints to encourage optimal energy return and reduce internal stress. Brooks BioMoGo and Brooks DNA technologies are combined to give the entire midsole adaptive properties. With each foot strike, the BioMoGo DNA tunes the cushioning and responsiveness to the specific needs of each and every runner. With enhanced Toe Flex, streamlined medial side design, and a slightly more rounded heel, this kick is ready to kick.