Nike Mercurial Vapor X (FG) Men"s Firm-Ground Football Boot EXPLOSIVE SPEED. Nike Mercurial Vapor X (FG) Men"s Firm-Ground Football Boot is made for the new generation of football masters. This lightweight, elite performance boot optimizes explosive speed with an updated Vapor traction system while the micro-texture upper adds grip for enhanced ball control. Tongue-less upper wraps the foot for a locked-down fit. Micro-texture synthetic upper for barefoot feel and high-speed control. Lightweight nylon chassis plate with Vapor traction system for responsive grip. Midfoot reinforcements enhance lockdown. 4-stud heel design offers optimal penetration and stability. Designed for play on firm, natural surfaces. Synthetic Leather