NIKE Men&#39;s Dual Fusion X 2 Running Shoe (7.5 D(M) US, Black/White/Dark Grey),Nike,819316-001" /> Synthetic Dual-density foam for a plush blend of cushioning. Midfoot Flywire cables lock the foot down. Pressure-mapped outsole helps promote a smooth transition. Single-layer mesh for lightweight ventilation. Molded blades and flex grooves promote a natural range of motion.