The Nike LunaRacer+ 3 running shoe features a new mesh upper including Engineered Mesh, that eliminates the need for overlays, and Dynamic Flywire that allows for a fit that changes along with the shape of the foot during the gait cycle. Lunarlon midsole provides a soft, yet responsive ride without adding much weight to the shoe. Carbon rubber in key areas of the outsole gives traction and durability. Wt. 6.2 oz.