TECNO 3 SYSTEM: SIDI's TECHNO-3 SYSTEM dials in fit along the entire length of the shoe, adapting the upper to the shape of the foot for a customized fit. SIDI's famously reliable and replaceable closures are improved by an all-new proprietary SIDI Wire material that is completely non-binding for intuitive and effortless on-the-fly adjustments. Like most SIDI small parts, the TECNO-3 BUCKLE is serviceable and replaceable. POLITEX: The politex material is constructed of several overlapping layers with different physical-mechanical properties, the compacted PVC is then coupled to two fabrics (knitted fabric + felt) that is then is film dyed for long-lasting color retention. Politex offers strong resistance to ripping, laceration, stretching and fading. Politex is made in strict compliance with European regulations and is a totally "green" product. CALIPER BUCKLE: The micrometric closure called "CALIPER BUCKLE" is adjustable by lifting the central buckle. In order to completely open, lift together both side buckles, or push the center button to slightly loosen one tooth at the time. The system is also adjustable during a race. Outdoor High-Performance Sole: The OUTDOOR rubber high-performance sole has the correct density for variable trial conditions and has been designed to provide excellent grip and to easily expel mud and debris. 4-holes plate for SPD pedals.