SLR Boost's compact shape provides the perfect combination of comfort and performance Fibratek is Selle Italia's latest cover material offering supreme durability SuperFlow features a large anatomic central relief area which allows rider to sit comfortably and pedal efficiently Ti 316 7mm rails are hollow titanium, a balance of strength and light weight Become an idmatch dealer to fit the correct saddle to your customer. For more information on idmatch visit http://www.selleitalia.com/en/idmatchsystem/ L3: “Wide” intertrochanteric distance and high pelvic rotation (Flow and SuperFlow saddles) S3: “Narrow” intertrochanteric distance and high pelvic rotation (Flow and SuperFlow saddles) L1: “Wide” intertrochanteric distance and low pelvic rotation