With the React Infinity 4, you can hit the ground running and leave all your worries behind. It's equipped with soft, responsive React foam and updated with our most snug-fitting Flyknit. So you can take off anytime, anywhere without worrying about wear and tear. It's the kind of shoe that gives you the priceless feeling of being able to run longer, faster and further than ever before thanks to high foam stacks and an intuitive design that supports every step. Smooth and stable The rounded outsole provides a more natural feel and more efficiency when running. This means you waste less energy when running. It provides flexibility when the foot lifts off the ground, a smooth ride when the foot moves forwards and cushioning on contact with the ground. Optimum cushioning Nike React technology uses durable, lightweight foam for a soft, responsive ride. The stacked cushioning is located directly underfoot so you're closer to the foam for a truly responsive feel. Support and breathability Flyknit in the upper provides breathability to keep your foot feeling secure without suffocating. A water-repellent lining in the toe area provides protection in bad weather. So you can keep going and won't be slowed down by the elements. The Flyknit tongue is adjustable and soft to minimise ankle and heel irritation on longer runs. An integrated Flyknit fit band ensures an elasticated, secure fit. The foam collar provides a soft, supportive feel. Reinforced rubber on the outsole provides traction and durability.