Nike Mercurial Vapor IX FG - Boys' Grade SchoolYou might have thought the Mercurial was as fast as it could be. Unfortunately for defenders, you were wrong. The Nike Mercurial Vapor IX is back, with even more lightweight speed. The Teijin upper includes speed control technology, with a texture you can see and feel. This provides the optimal control in all conditions, because there's no time for second-guessing in this game. The contoured last delivers a glove-like fit that is complimented by a light, perforated sockliner and textile top cloth. These mirror the foot's natural shape for low-profile cushioning. Underneath, the outsole is two layers of glass composite holding direct-inject TPU studs that are built for extreme comfort and acceleration on firm, natural surfaces. Twin heel studs provide ground penetration and stability. Wt. 6.1 oz.