Ergon ST Gel Saddle - Chromoly Mens Small/Medium BlackErgon ST Gel Saddle Chromoly Balck Mens Small Medium. The ST Gel takes the popular shape and comfort features of the ST Core and brings it to the more cost conscious rider. The wide seating surface is made for the upright seating position the typical posture of a touring rider. The large sitting area provides pressure distribution for sit and pelvic bones Relief channel provides increased protection for soft tissue areas Orthopedic comfort padding