Synthetic Rubber sole Forefoot Zoom Air unit delivers highly responsive cushioning. Seamless mesh upper with Flywire cables provides comfortable support. Ultra-thin outsole keeps weight low and traction high. Zoom Air unit in the forefoot delivers responsive, low-profile cushioning. It??s loaded from the bottom for a smooth transition. Flywire technology wraps the midfoot and arch for a dynamic, glove-like fit. It runs through the lace loops to help reduce pressure on the top ridge of the foot.