The cushioning and support you need for high-speed running and training. Breathable, lightweight upper with 3D Fit for support. Plush tongue and collar for a soft, comfortable fit. Lightweight U4ic midsole for response and ground feel. Parallel Wave in the heel for high-speed cushioning with every step. SmoothRide Engineering creates a smooth, rocking-chair motion for a natural running stride. X10 carbon rubber outsole for durable traction. Wt. 6.3 oz.