VS X models are for riders who want a fi’zi:k saddle with a relief zone. This is a solid-base saddle with an ergonomic channel spanning the length of the saddle. The saddle features a 20mm-deep relief channel set between two specifically-formulated double injections of foam. Aliante VS X is for The Bull: Rigid Spine If you have a relatively low degree of spinal flexibility (more than 90 degrees between your straight legs & back when bending over as far as you can, keeping your legs straight a shoulders’ width apart), you are a Bull. Your degree of Spinal flexibility will top out quite quickly when attempting to adopt the performance position. For this reason you will rotate you pelvis fully. You will benefit from the increased curvature (pelvic support) of the Aliante shape. Provided this saddle’s width isn’t too narrow for them, some women may find this model comfortable due to the presence of the relief channel.