INSTEP 4: The closure system is equipped with the ergonomic INSTEP strap, positioned on the instep, profiled, soft and anatomical. Tecno 3: Allows you to close the shoe quickly and easily, adapting the upper part to the shape of the foot. A totally new and lightweight design, reinforced to avoid deformation after prolonged efforts and pressures. Lightweight and performance, the SR17 MTB sole is made of nylon with PU inserts. The shape of the inserts has been designed for the mountains.