Nike React Infinity Run Flyknit 2 is still one of Nikes most tested running shoes which has been designed to prevent injury. The upper has been updated with Flywire which combines with Flyknit for increased breathability and support. The extended midsole height provides lasting comfort and soft responsiveness. Nike React Infinity Run Flyknit Specifications Neutral running style For daily training Reduces risk of injury 9 mm drop New Flywire-upper Midsole providing soft resposniveness and extended comfort Upper React Infinity 2 is engineered with a Flyknit-upper which provides increased breathability in areas where you need it the most. The fabric is very durable and provides great support to increase your comfort. Flywire in addition guarantees extra stability and midfoot support. Midsole Nike React Infinity Run Flyknit 2 is produced with a React-midsole made from light and durable foam to provide an even and resposnive run. The midsole is shaped like a rocker which contributes to increased flexibility as your feet leave the ground. It also guarantees a more even and cushioning run. Outsole The Infinity 2 outsole is produced with additional rubber to deliver more traction and durability. The wide shape provides a stable run which helps to release more energy at every step.