The sidi avast rain road shoes are ideal for riders who want all the performance of sidis summer shoes but with the added protection afforded by an ankle length cuff and water resistant membrane sidi have included all the features you would expect to give the best fit and feel as well as all weather protection paired with a stiff carbon composite sole the millenium 4 carbon composite sole features injected carbon fibre in a matrix of nylon to provide more rigidity than a standard nylon sole