The Nike ZoomX Invincible Run FK 3 is the latest iteration of Nike's high-performance running shoe series. Featuring ZoomX foam technology in the midsole, these shoes provide exceptional energy return and cushioning, allowing for a responsive and comfortable ride. The "FK" in the name likely refers to the Flyknit upper, which offers a snug and supportive fit while allowing for breathability and flexibility. Additionally, the Invincible Run FK 3 is designed with a wider platform for stability and a smooth transition from heel to toe. Whether you're logging long miles or tackling speed workouts, these shoes are engineered to keep you running comfortably mile after mile.