Fizik antares r1 versus evo saddlethe antares r1 versus evo from fizik is a high performance saddle that features a neutral shape and a pressure relief channel. This channel runs from the rear right to the nose of the saddle, helping to reduce pressure on the perineum area so you stay comfortable for longer.spine concept evothis saddle is categorised as a chameleon type within fizik's spine concept system, which means it's ideal for riders with a medium amount of spine flexibility and those who have a minimal amount of pelvis rotation when pedalling.advanced shell design the shell of the antares r1 open is a carbon fibre reinforced nylon, which features wing flex technology to enable the full natural movement of the pelvis. This improves comfort and maximises pedalling efficiency and with the addition of fizik's comfort core foam and a microtex cover, the comfort level is enhanced even further.carbon fibre railsa high quality carbon reinforced shell isn't the only major plus point with this saddle, it also has braided carbon rails. These rails are strong and lightweight and combine with the shell to give you optimum pedalling efficiency.†don't know if you're a bull, chameleon, or snake? No problem! You can download fizik's handy spine concept evo app and test your flexibility. Simply search for spine concept evo in the itunes app store or google playstore and download it to your device.for assistance on how to use the app, click here.features  cover light microtex  shell carbon reinforced nylon  rail 7x9mm carbon braided  padding comfort core foam  versus pressure relief channel  integrated clip system compatible  dimensions regular 275x142mm large  275x152mm  weight regular 179g large 185gbuy fizik components from chain reaction cycles, the world's largest online bike store.