Sidi Nubes Winter Cycling Boot – Black 47 Millenium Fit. The Sidi Nubes Road shoe is designed for cyclists seeking a blend of speed and warmth during cold weather rides. It features a high-tech upper construction for a sleek aerodynamic profile and a stiffness 7 sole for optimal power transfer with each pedal stroke. The shoe includes a waterproof membrane and a carbon-reinforced sole offering both performance and protection against the elements. Additionally it has reflective inserts for safer night cycling a reinforced toe for durability and a quicklace closure system for a secure fit.