Key Features: Materiale 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. , Soft Instep 3 System The SOFT INSTEP CLOSURE SYSTEM is a wide, anatomically curved strap combined with a soft, thermo-formed EVA pad that distributes pressure evenly over the instep area. The SOFT INSTEP CLOSURE SYSTEM is adjustable from both sides, to perfectly center the EVA pad over a high or low instep. The system eliminates the need for the High Instep Extender. The SOFT INSTEP CLOSURE SYSTEM is replaceable. , 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. , Tallone Sidi The reinforced heel keeps the foot in a optimal position and avoids the shoe being deformed by extreme performance or prolonged pressure. , SUOLA MTB RS17 Lighter and more performing the new Sidi MTB sole is made of nylon with PU (polyurethane) inserts. The shape of the sole tread has been specifically designed for mountain bike, it allows a good grip, facilitates mud dispersion and provides the right stability. The central insert with the Sidi logo works as non-slip and it is  practical and useful especially to the less experienced users. The toe area that is more subject to wear, especially when walking, can be replaced by screws and still offers the possibility to mount crampons to improve traction on particularly muddy grounds. RS17 represents the ultimate result in terms of stiffness for pedaling and flexion for walking. .