Politex With a multi-layer structure, the Politex upper material combines the different properties of compressed PVC, textile and felt. It is shock and tear resistant, dimensionally stable, durable and colorfast. Manufactured according to European environmental guidelines. MTB Competition Sole Carbon fiber reinforced nylon sole with integrated plastic inserts for optimal traction in running passages. Tecno-3 system The SIDI Tecno-3 system adapts to the foot over the entire length of the shoe in order to achieve an individual fit. SIDI's reliable and interchangeable closures are enhanced with a new SIDI Wire material designed for intuitive and effortless on-the-fly adjustments. Like most SIDI small parts, the Tecno-3-Buckle can be maintained and replaced.