Lightweight performance. Made with a carbon lay-up method to create thinner yet stiff rails. The handmade padding is applied only where you need it, helping to keep you comfortable. Available with or without a Superflow cutout. L3 and L1: aWidea? intertrochanteric distance and high pelvic rotation (Flow and SuperFlow saddles). S3 and S1: aNarrowa? intertrochanteric distance and high pelvic rotation (Flow and SuperFlow saddles)