It is shaped with aerodynamics in mind, with a carbon composite sole that is stiff enough to transfer power effectively to the pedals, though with just enough flexibility to make walking a touch easier. The toe, meanwhile, is reinforced, to ensure you won't have to worry about stones when you're pedalling hard.With a fit cinched in by Sidi's quick, strong and easy-to-operate rotor closing system and reinforced by the wrapper closure system and Firmor lateral support band, which respectively secure the ankle and anchor your foot, this is an accomplished racing shoe with an added touch of cosiness.An extra-warm and breathable, performance racing shoeUpper of textile and TPU, reinforced with a new Gore-Tex® ePE (polyethylene) membraneEco-friendly and weather resistant, highly water resistant and windproofLined with warm but low-bulk PrimaLoft® insulationWith nylon and carbon fibre R2CC sole, stiffness index 9, with replaceable insertsSecured by impact-tested, high density dialling system