Within Fizik’s Spine Concept system this saddle is categorised as a " Chameleon" type. This means its designed for those who have medium spine flexibility & who’s pelvises have a low amount of rotation when pedalling. Advanced Shell Featuring a composite nylon shell that’s reinforced with carbon fibre, this saddle is supportive & lightweight, but it also allows enough flexibility so you can achieve full pelvic rotation. This ensures maximum pedalling efficiency & lasting comfort. Carbon Fibre Rails In addition to the carbon fibre reinforced shell, this saddle has braided carbon rails. These are light, strong & combine with the shell to ensure ultra-efficient power transfer