The Nike Air Zoom Structure 25 is designed for miles of reliable performance, whether for short training runs or demanding drills. It offers the stability you need with a full midfoot support system and a dynamic Zoom unit for a responsive feel. The forefoot provides ample room to prevent toe compression, contributing to a wider base and a fluid stride. A Zoom Air unit in the forefoot delivers responsive cushioning, with each stride generating energy feedback for a dynamic propulsion. Enhanced with more Cushlon foam than previous models, it provides durable support through thick foam layers. The pendulum-shaped foam supports all three phases of your stride, offering optimal flexibility during impulse, a fluid transition as your foot moves forward, and excellent cushioning.