saucony mens omni 21PWRRUN cushioning gives you springy energy return and plenty of durability. Extended medial post supports the bodys 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 provides cushioning