Ergon SC Core Prime Saddle - Black/Gray Womens Small/MediumErgon SC Core Prime Saddle Black Gray Womens Small Medium. Ergon SC Core prime saddle is adapted for city and comfort touring bikes. This effect of putting far less strain on your back has been awarded with the seal of quality of "Campaign for Healthier Backs". Ergon Ergonomics Laboratory has worked hard to optimize the saddles surface design for the anatomical requirements of a very upright riding position and for both men and women. The pronounced