Offering both quality and comfort the genius 5 fit pro from sidi is the road cycling shoe of choice for many professionals the millennium 3 sole is made from a more rigid and more durable carbon fibre than previous versions whilst the adjustable soft instep 2 closure system provides increased comfort for an all round classic road shoe rk millenium 4 carbon composite sole it features injected carbon fibre in a matrix of nylon providing more rigidity than a standard nylon sole