Nike Men’s Zoom Structure 21 running shoe - size US 10.5 - color gray and yellow accent - very gently used. - Tread has no visible signs of being worn down. - Insoles used but clean and in good condition. It features a one-piece, breathable upper that is reinforced with Flywire and Dynamic Fit technology for stability and a customized fit. The shoe also has responsive Nike Zoom Air cushioning in the forefoot and a firm heel structure for additional support.