Designed and tested* to minimize and reduce injury during runs, the Nike React Infinity Run FlyKnit running shoes feature an extended foam midsole and a cradling design that hugs the foot and keeps you stable on the track. * In testing, the Nike React Infinity Run reduced running injuries by 52 percent compared to the Nike Air Zoom Structure 22 in a study of 226 men and women during a 12 week run training program (injury = missing 3 or more consecutive runs due to running related pain). Our study found that 30.3 percent of Nike Air Zoom Structure 22 runners experienced an injury but only 14.5 percent of Nike React Infinity Run runners experienced an injury. Support Type: Neutral. Cushioning: Lightweight, flexible response. Surface: Road. Differential: 9mm. Wider forefoot and high foam stack along with a technical FlyKnit upper provides a more comfortable ride. Lightweight, breathable FlyKnit fabric upper features three distinct layers to keep your foot secure. Lace-up closure features flat laces for a close fit. Bootie-style collar and tongue provides comfort around your heel. Easy on-and-off pull tabs at the collar. Removable insole. Nike React midsole cushioning resists compression and returns energy every step using less material for a more responsive and smooth ride during all three steps of a runners stride. Increased rubber at the outsole provides traction and durability. Imported. Measurements: Weight: 10.27 oz Product measurements were taken using size 10, width D - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.