NIKE Jr Mercurial Vortex III FG (Total Crimson) (5.5) Synthetic The upper is made with a synthetic material to help hug the foot and create a comfortable fit. A synthetic also ensures the durability of the cleat. A light micro-texture helps with keeping the ball close to the foot. A velcro strap on the top of the lacing keeps the foot locked into the shoe, minimizing slippage. A flexible outsole provides support and comfort for the whole game. Conical studs provide better traction and reduce some of the stress on the foot.