FluidFit upper stretches and moves with the foot, combining breathable mesh and supportive overlays to create a glove-like fit and feel. ComforDry X-40 sockliner prevents the growth of odor-causing microbes and wicks away sweat, keeping feet feeling dry and fresh. Dual-density Dynamic DuoMax Support System increased support and stability. Rear and forefoot GEL Cushioning Systems cushion and absorb shock with every step. Impact Guidance System's linked componentry increases flexibility and encourages a more natural running stride. Guidance Line vertical flex groove creates a smooth transition from heelstrike to toe-off. Wt. 9.1 oz.