Brooks shifted their focus from the feet, to the most injury-prone part of a runner's body: the knees. GuideRails keep you centered and moving comfortably by keeping excess movement in check. BioMoGo DNA midsole cushioning and rebounding rubber create a springy feel underfoot. The Midfoot Transition Zone is shaped to go from heel to toe quickly. Fast, supportive and comfortable…. all wrapped up in the Ravenna 10.