The Fi'zi:k Aliante Versus Road Bike Saddle combines fi'zi:k's Spine Concept, its proven technology and offers something new to meet some riders' needs: a central relief channel. The Aliante shape is the widest and most longitudinally waved of fi'z:k's trio of pro-cyclist-developed Spine Concept models. Made for the Bull profile of riders with a more ridged spine and upright riding style. The Aliante Versus K:ium adds the Comfort Channel along the length of the saddle. It features a carbon reinforced Nylon shell for support with optimized stiffness to-weight construction -- with Twin Flex technology which combined a song, stiff carbon layer with a flexible, comfortable carbon layer -- and an alloy rail for light weight and strength.