Antares R3 Versus Evo features a composite Carbon-reinforced nylon shell with Wing Flex technology which enables flexibility where your thighs meet the saddle and a light, strong, corrosion-resistant K ium rail. A Comfort Core foam layer beneath the neat, durable Microtex cover provides comfort, which is enhanced by the full-length comfort channel that reduces pressure on the rider's sensitive soft tissue and ensures that all weight is correctly supported across the whole surface of the saddle. Like all performance fi'zi k road saddles, Antares R3 Versus Evo is light, flexible and agile. It's designed for pros, with pros and raced by pros.With full-channel comfort and advanced technology, materials and craft, Antares R3 Versus Evo is a performance road saddle for riders who want a medium saddle profile and a pressure relief channel. Versus Pressure Relief Channel Shell Carbon-reinforced nylon Cover Light Microtex k ium alloy 7mm rails. Weight Regular 215g, Large 220g ICS clip system compatible