Nike React technology delivers a soft, responsive ride. It provides support for the 3 phases of a runner's stride—flexibility at toe-off, a smooth ride at mid-stance and cushioning at contact. The latest in Flywire technology features an elastic design that intertwines with the Flyknit upper, helping your foot feel secure as you run. 3 forefoot layers combine for a lightweight, breathable and durable feel that helps keep your foot comfortable. Molding around the heel helps you feel secure so you can focus on your route. Increased rubber at the outsole helps deliver better traction and durability.