Flyknit upper features specific zones of breathability. It's strong and durable, helping your foot feel secure and contained without being restrictive. Smooth and Steady Ride Nike React technology delivers a smooth, responsive ride. Shaped like a rocker, the foam has been engineered to provide support for all 3 phases of a runner's stride. It offers flexibility when your foot pushes off, has a smooth ride as your foot moves forward and cushioning for when your foot hits the ground. Cushioned Feel, Higher Stacks Less material between the insole and midsole means you're closer to the foam. This helps create a more responsive experience, while a higher height of foam provides a softer feel. Hybrid tongue combines a sock-like feel with the adjustability of traditional laces. Cushioned collar provides soft comfort. Rubber on the outsole helps deliver traction and durability. A wide shape provides a more stable ride, helping release energy with every step.