On(R)'s iconic road runner gets a performance upgrade. Featuring a new dual-density midsole for softer landings and more powerful take-offs. Plus, a breathable flat-knit upper and cage construction, for secure foot lockdown and a fresh aesthetic. Design: Snug bootie construction is updated with a single-piece knit for maximum airflow Perforated toe box further boosts breathability 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 Updated design and fit of the shoe's iconic cage construction for better midfoot lockdown New knit material for a more modern look In-Shoe Comfort: New dual-density midsole is made with two types of Helion(TM) superfoam - for soft landings and powerful take-offs Previously made with TPU, the new nylon- blend Speedboard(R) produces an energetic and responsive ride Additional Details: Best for: Running, Road running