Reactivity, breathability and comfort. The Nike air zoom gravity running shoe offers a responsive gait, maximum strength and ideal multi-surface traction. The upper in engineered mesh ensures support and breathability in strategic areas, while the inner lining offers comfort and a perfect fit like a glove, step by step. Fly mesh material designed for support and breathability. Dynamic fit system with flywire cables for ideal support and grip. Nike zoom air unit and cushioned foam sole for responsive cushioning. Sturdy rubber tread for ideal traction on multiple surfaces.