SuperFlow features a large anatomic central relief area which allows rider to sit comfortably and pedal efficiently \n Fibratek: Selle Italia's latest cover material offering supreme durability and comfort \n Carbon Rails \n For more information on idmatch visit http://www.selleitalia.com/en/idmatchsystem/ \n L3: “Wide” intertrochanteric distance and high pelvic rotation (Flow and SuperFlow saddles) \n S3: “Narrow” intertrochanteric distance and high pelvic rotation (Flow and SuperFlow saddles)