Engineered for reliable propulsion at any distance, this running and racing shoe sits on a responsive carbon fiber plate and high-rebound Nike React foam. The translucent upper sports Chicago Marathon detailing and encases a stretchy inner sock for a sleek look and distraction-free fit. It's grounded on a molded sole that swoops aerodynamically along the sides and tapers to a neat keel that arches away from your ankle to reduce pressure on your Achilles tendon.