Incredibly lightweight at a mere 259g the base of the brooks c13 cambium saddle is constructed entirely of a carbon fibre monocoque structure for maximum weight saving combined with a vulcanised rubber base the c13 cambium offers the best in comfort and weight saving now available in 3 widths to perfectly fit every cyclist also available with carved cut out for additional perineal pressure relief brooks c13 cambium saddle features tested in the arenberg forest by david millar comf