The Nike Zoom Rival Fly features a futuristic look with cushioning in the forefoot that gives you a responsive feel. Flex grooves underneath optimize toe-off and soft foam cushions your stride. A Zoom Air unit in the forefoot delivers responsiveness, keeping up your momentum with every step. Underfoot foam provides soft cushioning. Combined mesh and synthetic materials deliver breathability. An internal fitband around the midfoot creates stability, while a rubber crash pad at the heel helps absorb impact.