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Soft Instep Closure System Soft Instep Closure System is a contoured strap placed on the neck of the foot, flexible and anatomical coupled with a soft material for added comfort. Distributes pressure evenly over the neck of the foot and adjusts on both sides for a perfectly centered position of the strap depending on whether the instep is low or high. The system eliminates the need to use a spacer. Soft Instep Closure System is replaceable. Tecno-3 System allows you to close the shoe along its entire length, adapting the upper to the shape of the foot and thus obtaining a personalized fit. The reliable and fully replaceable Sidi closure systems have been improved thanks to a new type of cable, allowing quick adjustment with extreme ease. TECNO-3 SYSTEM can be adjusted even in racing thanks to an innovative button. Pressing the lever, which facilitates adjustment. SIDI integrated heel The heel is integrated, newly designed and lightweight, reinforced to prevent deformation after prolonged stress and pressure. Anatomically molded, stabilizes and supports the foot when pedaling. Reflex inserts on the heel provide greater safety for the athlete on the road, helping to signal the presence of the cyclist in conditions of low visibility. SR17 MTB sole The new Sidi MTB sole is made of nylon with PU inserts. The shape of the inserts has been designed for mountain biking, allows an excellent grip, facilitates the dispersion of mud and gives good stability. The central insert characterized by the Sidi inscription serves as a non-slip, practical (useful) especially for the less experienced. The tip of the wear zone (especially) when walking, can be replaced with screws and always offers the possibility of mounting the studs to improve traction on particularly muddy terrain. The SR17 represents the best result in terms of rigidity for pedaling and bending for walking.