Nike Womens React Infinity Fly Knit running shoe size 9.5 US. Purchased new but does have some scuffing on back heel (pictured) otherwise in excellent condition. About this item: Nike React technology is a lightweight, durable foam that delivers a smooth, responsive ride. High-rise cushioning is placed directly under your foot so you're closer to the foam for a truly responsive experience. Hybrid tongue combines a sock-like feel with the adjustability of a traditional design. Soft padding along the collar provides a cushioned touch point. Additional rubber on the outsole gives traction and durability.