As part of Fi'zi:k's Versus line, the Antares VSX K:ium Saddle features a 20mm channel along its center to relieve pressure on sensitive tissues. Soft, low density cushioning surrounds the relief zone to further enhance comfort and eliminate the sharp ridge effect that many early adopters of pressure relief channels were saddled with. Despite these comfort enhancing additions, the Antares VSX still follows the same length and width dimensions as its race ready Antares cousins, and the K:ium rails keep the saddle's weight low while absorbing road noise for a smoother, less fatiguing ride. The carbon reinforced nylon shell is designed to strategically flex just enough to provide give without feeling like a trampoline underneath you. The engineered flex teams with the saddle's race inspired shape so that it won't impede your leg movements while pedaling. Fi'zi:k finishes the saddle with a durable Microtex cover, which loyally serves to protect the generous padding from exposure to the elements. The Antares VSX falls into the chameleon category within Fi'zi:k 's Spine Concept guidelines, which is the brand's approach to finding the right saddle by identifying differences in spine flexibility among cyclists. The chameleon references cyclists with a moderate amount of spine flexibility who tend to be most comfortable on a wider, flatter platform.