The castelli free aero race bib short new and updated for 2015 the castelli designers studied and improved on every detail on this the new free aero race bib short every component of the free every fabric every construction method every stitch was appraised considered and redesigned in the pursuit of perfection the lines are still classic free but in fact only the mesh fabric in the bib straps carries over from last year every other component and aspect has been redesigned obsessed o