Diadora x vortex comp mtb spd shoesdiadoras x vortex comp shoes are for cyclists who demand a lot from their shoes while out on the trail the carbon reinforced speed mtb kr sole has a respectable stiffness index of 8 out of 12 which means it helps prevent vibrations to your feet the shoes feature diadoras suprell tech morpho am cage technology which are the same uppers found on the companys top of the range road shoes inside the upper the eva insert is perforated to further promote breatha