UPPER Double layer Microfibre, with the external part perforated. Alcantara insert under the big toe area. The Wave Closure System keeps the upper firmly on the foot while in motion. Stretch gusset allows easy entry. INSOLE 1 mm Flexan insert supports the Flexor hallucis longus tendon (FHL) and increases precision. ACTIVE RANDING IPR active randing system gives the shoe top-level flexibility and maintains tension from forefoot to heel. SRT toe rand system with M50 rubber for unrivalled toe-hooking ability.SOLE 1/4 length outsole in Vibram XS Grip 2 compound 3.0mm, heel covered with XS GRIP 2 with 2.0mm thickness.