Northwave crono extreme aero spd sl road shoesthe crono extreme aero shoes from northwave are an ultralight shoe with holes that correspond with the vents on the sole to keep your feet fresh northwave have completely redesigned the footbed to provide greater support for the arch and along the medial area to provide enhanced efficiency and comfort featuressole ultralight carbonupper ultralight microfiberupper construction biomap without stitchingclosing system slw 2heel integrated heel s