With more beveling at the heel and forefoot and a more flexible outsole, each step flows easily into the next. Pair that with PWRRUN cushioning for a soft, springy feel and you have the perfect blend of support and comfort. It’s the perfect ride for all the easygoing miles that lie ahead. PWRRUN cushioning gives you springy energy return and plenty of durability. Extended medial post supports the body’s natural alignment with added guidance. More flexible TRI-FLEX outsole for a smoother run. FORMFIT hugs the foot in 3D comfort and delivers our most personalized fit yet. Engineered spacer mesh provides structure or stretch where needed and enhances breathability. A combo of iBR in the forefoot and XT-900 in the heel provide cushioning where you want it and durability where you need it.