Women's On Cloudswift 4 - White/White The shoe's snug bootie construction is updated with a single-piece knitted upper for maximum airflow. The perforated toe box further boosts breathability. For a cushioned yet energetic ride, the midsole's top layer is made with soft Helion™ superfoam, while denser foam on the bottom provides a more propulsive push-off. We updated the design and fit of the shoe's iconic cage construction for better midfoot lockdown. Plus, it's now finished with a new knit material for a more modern look. DETAILS: Weight: 248g New dual-density Helion™ superfoam midsole for soft landings Breathable one-piece upper with perforated toe box Updated cage construction for better midfoot lockdown Nylon-blend Speedboard® for a responsive ride Fresh aesthetic and comfortable fit Rockered geometry for a forward-rolling sensation Responsive daily shoe for road and city running Versatile style for before, during and after a run