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 is a wide, anatomically shaped strap combined with a soft, thermo-formed 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 offers additional safety in road traffic. Replaceable Heel Pad: All Sidi road shoes feature a replaceable polyurethane heel in the heel area. Comfort Fit Insole: Insole made of ergonomically shaped foam with antibacterial properties and perforation for optimal ventilation. Carbon Composite 20 Sole: The Twelve Carbon Composite Sole is a carbon fiber-reinforced nylon sole with a full carbon insert, providing excellent power transfer combined with flexibility in the forefoot area. The ideal combination of stiffness, comfort, and lightweight. Alignment scale for optimal pedal adjustment. Compatible with all common road bike pedal systems.