This shoe is for runners who need a perfect blend of support, cushion, flexibility and reliability. It's more streamlined now, but it's the same shoe we all know and love. What's new? New GuideRails holistic support system and DNA LOFT crash pad. BioMoGo DNA and DNA LOFT cushioning work together to provide a just-right softness underfoot without losing responsiveness and durability. GuideRails keep you moving comfortably by keeping excess movement in check.