The Fi'zi:k Aliante VSX K:ium Saddle's shell is made from carbon reinforced nylon with double injected foam padding and features a 20mm deep channel design that relieves pressure in sensitive areas. Fi'zi:k's Wingflex technology delivers optimal support by making the top of the saddle stiff while the outer edge is allowed to flex through the pedal stroke. Its Kium rails use a special alloy with a high strength to weight ratio and excellent vibration damping for increased comfort on chattery surfaces. Fi'zi:k finishes this saddle with a durable Microtex cover, which loyally serves to protect it from exposure to the elements. The Aliante VSX falls into the bull category within Fi'zi:k's Spine Concept, which is the brand's approach to finding the right saddle choice by identifying differences in spine flexibility among cyclists. With its wider stance and waved shape, the Aliante platform is the top recommendation among the Fi'zi:k saddle range for cyclists with a relatively rigid spine who tend to ride with a forward pelvis tilt.