Fizik's Kurve series of saddles is designed to maximize comfort while minimizing padding. Fizik know that padding can degrade over time, leading to a saddle that's not nearly as supportive as it once was. By using a single, continuous rail that runs around the perimeter of the saddle, the Kurve saddles provide support in much the same manner as a hammock you're effectively suspended between the rails. This particular Kurve sadde is designed for Bulls, according to Fizik's Spine Concept. Bulls are riders with a bit less spinal flexibility, who are more likely to tilt their pelvis forward on the bike, and thus need a bit deeper 'pocket' in the saddle for comfort. This saddle also makes use of ovalized, 7x9mm aluminum rails, meaning it will only be compatible with seatposts designed for ovalized rails.