Nike flex fury 2 running shoes junior boys these nike flex fury 2 running shoes are designed with a lightweight breathable mesh upper with lace up fastening padded ankle collar cushioned insole and flywire cables that provide lightweight support to the foot there is a thick mid sole foam for a cushioned yet flexible ride and flex technology which uses grooves to the grip sole underfoot to offer a more natural feel finished off with the iconic nike swoosh to the sides boys running