NIKE AIR ZOOM RIVAL FLY 4 Size: 28cm Pick up the pace with the Nike Rival Fly 4. Featuring an Air Zoom unit in the forefoot and Cushlon 3.0 foam, this lightweight and low-profile design helps you maintain speed on the road and stay fresh even on long runs. The Air Zoom unit in the forefoot provides sharp takeoffs and stable responsiveness. Cushlon 3.0 foam, which is more flexible and responsive than the previous version. Durable plastic parts in the midfoot provide a quicker and more responsive weight transfer than the Rival 3. The race-inspired, perforated tongue has increased padding for comfort and breathability.