The Sidi Genius X Vapo shoe enhances the Genius line by providing improved ventilation thanks to an upper made of open-pore foam, which optimizes air circulation and moisture management. Ideal for hot conditions or longer efforts, it features dual Nuun rotary knobs, a high-density midsole, and an R3CC composite carbon sole (stiffness index 6). Inside, the Firmor X structure wraps around the foot for lasting stability and support. Lightweight, ventilated, and designed for hours of cycling in maximum comfort. Millennium Fit: Same shoe size as your sneakers. The Millennium Fit is the latest innovation. This new design has a slightly wider shape that offers greater comfort and better adaptability to the foot.