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. Made using a single piece of flat-knit engineered mesh, the breathable upper has a snug, sock-like fit that adapts to a wide range of foot shapes.