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.