VS X models are for riders who want a fi’zi:k saddle with a relief zone. This is a solid-base saddle with a 20mm-deep ergonomic channel spanning its entire length, set between two specifically-formulated double injections of foam. Antares VS X is for The Chameleon: Medium Spine. If you have an intermediate degree of spinal flexibility (approximately 90 degrees between your straight legs & your back when bending over as far as you can, keeping your legs straight a shoulders’ width apart), you are a chameleon. Your degree of spinal flexibility helps you so far, before you need to rotate your pelvis slightly to achieve fully the performance position. You will benefit from the increased width & slight curvature of the Antares 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.