CASTELLI COMPETIZIONE BIBSHORT size S, DEEP GREEN. The thread sewing the pad has come loose, so it has been repaired from the back with craft glue. It will turn white when wet, such as during washing, but will become transparent when dry. I think it can be used for Zwift without any problems. The size is equivalent to Rapha's size S. I cannot answer questions about the size; please check the attached size chart. The color is easy to match with black, navy, and earth colors. It also goes well with orange and pink. How about this for your first colored bib shorts? There are no cracks in the markings. I feel that the pad has hardly deteriorated. Thank you for your consideration.