Outer Material: Synthetic Closure: laces Sole material: Rubber. Shop the (WMNS) Nike Air Zoom Structure 25 'Black Dark Smoke Grey'. Upgrade your sneakers collection today! Closure:lacing. Toe type:round toe. For miles and miles, short training runs or perhaps a suicide drill before the end or start of the day, the Nike Air Zoom Structure 25 is ready and waiting. Faithful from the premier lacing, reliable and proven, it gives you the stability you're looking for, with a system offering full midfoot support and a dynamic Zoom unit that keeps you on rapide.The form-fitting forefoot gives you plenty of room to keep your toes from feeling uncomfortably squeezed and compressed. It also offers a wider base and a fluid stride.A Zoom Air unit in the forefoot provides responsive cushioning. Each stride creates energy feedback to propel you forward with a dynamic, responsive feel.We've added even more Cushlon foam than before to provide more durable support with thick foam layers that allow you to take care of yourself. The pendulum-shaped foam provides support for all three phases of the stride. It offers optimum flexibility during impulse, a fluid stride as your foot moves forward and perfect cushi...