NIKE Junior Tiempo Natural IV Astro Turf Football Boots Natural leather upper - for durability, support and great comfort as well as great ball feel. Turf rubber Studs - For use on synthetic surfaces. Multidirectional turf outsole - with forefoot flex grooves and pivot point for optimal traction. Molded sockliner - this conforms to the shape of your foot for comfort and support. Extra heel cup and arch support - for superb comfort and good fit.