Ergonomically engineered to help optimize your body's alignment, natural movement and energy; Light pressure-diffusing Microwobbleboard midsole - triple-density cushioning follows 3 footstep stages (firm heel/soft middle/medium at toes); F-Mode Go version has two-layer construction for a new aesthetic and extra flexibility/lightness; Heel and forefoot 'impact pillows' enhance cushioning; Natural arch support; Narrow fit - so these shoes may feel narrow; Grip suited to everyday use/road tread