Upper Material: The upper material is made of microfiber. Microfiber is breathable and temperature-regulating, and thanks to its surface texture, it is dirt-repellent. Soft Instep 4: The Soft Instep Closure System features a wide, anatomically shaped strap combined with a soft, thermoformed EVA pad that evenly distributes pressure over the instep area. The Soft Instep Closure System is adjustable from both sides to perfectly position the EVA pad over the instep. The Soft Instep Closure System 4 is replaceable and available as a spare part. Tecno 3 System: The Tecno 3 System runs the entire length of the shoe, allowing for optimal pressure distribution. The upper material adapts perfectly to the shape of the foot thanks to the new system. Sidi's reliable closure system has been further improved and now allows for easy and quick adjustments, thanks to the new cable material. Like most Sidi small parts, the Tecno 3 System is replaceable. Sidi Heel Cup: The reinforced heel cup keeps the foot in an optimal position and prevents the shoe from deforming due to extreme performance or prolonged pressure. With reflective inserts, the heel cup provides additional safety in traffic. Rubber Toe: Protects the toes from impacts. Thanks to the anti-slip rubber compound, the Rubber Toe has slight cushioning properties. Comfort Fit Insole: Insole made of ergonomically shaped foam with antibacterial properties and perforations for optimal ventilation. MTB RS17 Sole: Carbon fiber-reinforced nylon sole with grippy plastic inserts and a rubberized SIDI logo in the midsole area, providing optimal traction in running sections and more safety when stepping into the pedal. Replaceable sole inserts in the toe area, which can optionally be equipped with studs for optimal performance.