When fashion meets function.FORMFIT with breathable engineered mesh and 3D-printed structure upper - Ensures a locked-in fit that's light on foot. New ultrlight PeBa®-based PWRRUN PB cushioning - Provides great energy efficiency so running at top speed feels easier. SPEEDROLL - Creates a lively rolling feel underfoot, providing an instantly responsive and natural ride at the same time. Drop - 8 mm. WEIGHT - 7.8 ounces