NIKE Tiempo Natural IV Firm Ground Football Boots Natural leather upper - for durability, support and great comfort as well as great ball feel. Soft-ground (SG) studs - for use on wet and muddy fields requiring maximum traction. Full-length TPU plate - Provides lightweight durability and comfort High-Density EVA sockliner - Provides contoured heel and arch support and reduces stud pressure. Flex Grooves - At the forefoot for enhanced flexibility and a better range of motion.