Nike flex fury 2 junior girls trainers the kids nike flex fury 2 trainers are a versatile trainer that can be used for a wide range of sporting activities as well as everyday wear designed with a moulded outsole with nike flex technology that helps to encourage the natural flexibility of the foot coupled with rubber inserts to key areas of the sole that help to enhance traction and durability these nike trainers also feature a seamless mesh upper that help to increase breathability along wit