An Air Zoom unit and soft foam offer pop and race-day speed. The Nike Zoom Rival Fly 4 can help you push your pace. Its lightweight, low-profile design has a forefoot Air Zoom unit and Cushlon 3.0 foam to help keep you fast on the road and fresh for your miles. Breathable Mesh Lightweight mesh on upper provides breathability. Responsive Pop A forefoot Air Zoom unit provides responsive toe-off and consistent pop. Softer, More Responsive Cushlon 3.0 foam is softer, more responsive compared to the Zoom Rival 3. Faster Transitions Strong midfoot plastic piece offers faster, more responsive transitions compared to the previous iteration. Extra Padding Race-inspired tongue is extra padded with perforations for comfort and breathability. Product Details * Weight: Approx. 258g/9.1oz (Men's US 10) * Heel-to-toe drop: 8mm