Nike mercurial vortex cr7 indoor court trainers childrens the nike mercurial vortex cr7 indoor court trainers feature a non marking outsole that offers excellent traction on indoor surfaces whilst the cushioned insole and padded ankle collar offer superb comfort around the foot the trainers are finished off with nike swoosh detailing on the front of the trainers along with cr7 detailing on the rear for a stand out look for any youngster indoor football trainers adjustable strap fas