Features Fixed shin plate Techno 3 iron mechanism to adjust the leg circumference Anti twist ankle support braces Zipper Elastic panel Side air ventilation system Replaceable slider Shock absorbing heel cup Nylon inner sole with removable arch support Tecno-3 iron TECNO 3 IRON mechanism closes the boot & adjusts the calf circumference with a resistant steel wire which, passing through the upper is fixed to the internal cable holder. TECNO 3 IRON, the upper & the cable holder are replaceable. Ankle support braces The two nylon braces join the ankle joint with two screws that are hidden by a nylon cap. This system supports the ankle & is reinforced with fiberglass & is easy to replace. This system allows excellent flex movement front-to-back while being firm side to side. Side air ventilation system On the outer lower part of the boot an air intake is fitted which can be operated by an aerodynamic shaped button. Zip elastic panel Sidi has added a small elastic panel to aid in a s...