Breathable engineered mesh upper for a comfortable, lightweight fit. Flywire cables are incorporated with the shoe's laces, delivering adjustable support and lockdown that can be tightened or loosened for a custom fit. 3/4-length Zoom Air unit combines with Cushlon Foam for soft cushioning and fast turnover. Rubber crash rail on the shoe's lateral side uses flex grooves and a segmented construction to help guide the foot through a smooth, natural transition from heelstrike to toe-off. Clear rubber outsole creates a visible window to the inner workings of Zoom Air. Pentagon-shaped outsole lugs for enhanced cushioning and traction on any surface. Wt. 8.8 oz.