Tuned cushionIntroducing DNA Tuned, the next generation of nitrogen-infused foam created with dual-size cell technology. Larger cells in the heel provide plush landings, while smaller cells in the forefoot invite responsive toe-offs.Accommodating fitNew engineered double jacquard knit upper provides a flexible, accommodating fit.GuideRails® holistic support systemOur innovative technology supports your body in its natural motion path while keeping excess motion in check.