Mavic ksyrium pro bib shortmavic ksyrium pro bib shorts provide excellent comfort and performance for long days in the saddle one of the secrets to their epic comfort is their new ergo 3d pro endurance insert made with multi layer ortholite memory foam in two densities for different rider weights it covers your ischal and perineum areas and increases shock absorption by 20 compared to a standard insert for extra comfort the insert foam is pre shaped to fit perfectly against the saddle in y