This boot is constructed of highly advanced Carbon Fiber. Carbon Fiber is a composite material similar to but much stronger than graphite. It offers an unmatched strength to weight ratio. In the Vapor SL the entire outsole is constructed of Carbon Fiber for an incredibly strong and light boot. The upper is a soft, supple Teijin synthetic leather that adjusts to the shape of your foot. A covered strike zone offers an increased striking area. Contoured sockliner with ventilation holes. TPU external heel counter. The outsole is carbon fiber and a lasting board with bladed studs for durability and stability on firm, natural surfaces. Weight (7.4 oz.)