These are Castelli's top-of-the-line bib tights. I own several Castelli bibs, but the Rosso Corsa model is in a class of its own. Also, they are very warm, so they were a great help on rides in extremely cold weather. The color is Belgian Blue. "RoS" is a designation for clothing that combines water repellency with all the functions required for winter riding, such as wind resistance, breathability, and moisture permeability, all at a high level. They are fleece-lined and very warm. CASTELLI SORPASSO ROS BIBT MEN'S