Ultra-light, high-performance MTB saddle offering firm support for the weight- conscious rider. inForm Science of Comfort design based on pressure mapping and 3D motion capture data, available in three widths for proper fit and support. Size Specific Curvature supports the skeletal structure in a way that's optimized for a performance-oriented riding position, resulting in greater comfort and proper blood flow. Gender-specific Contour Relief Zone (CRZ) gives added pressure relief to sensitive soft tissue. Saddle shape is optimized for off-road riding, featuring a narrow rear profile that makes it easier to get off and on the back of the saddle and a wider nose that helps you "steer" through technical terrain using the inside of your thighs. Super-light Zone Density foam provides superior cushioning without interfering with proper skeletal support. Carbon fiber-reinforced nylon base with oversized carbon rails keeps weight to an absolute minimum. Unconditional Comfort Guarantee. Requires oversized rail compatible seatpost. For Bontrager seatposts, use part # 421564.