An Air Zoom unit and soft foam offer responsiveness for 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 Upper Lightweight mesh on upper provides breathability. Soft Foam Midsole Cushlon 3.0 foam is softer and more responsive compared to the Zoom Rival 3. Responsive Toe-Off A forefoot Air Zoom unit provides responsive toe-off and consistent pop. Responsive Transitions Strong midfoot plastic piece offers faster, more responsive transitions compared to the previous iteration. Breathable Tongue Race-inspired tongue is padded and perforated for comfort and breathability. Product Details * Weight: Approx. 258g/9.1oz (Men's US 10) * Heel-to-toe drop: 8mm