With Adaptive Edge base & construction technology allowing the outer edge to conform to the riders body this is ultra-light saddle has been & tuned for an outstanding fit while the flat profile & thin padding are perfect for explosive efforts. Patented Body Geometry design is lab tested to assure blood flow to sensitive arteries Patent pending Invisible Edge construction provides a clean & streamlined shape Super-light EVA padding for comfort & performance on longer rides Stiff carbon-reinforced shell with flexible Adaptive Edge technology adapts to your body for unmatched fit & all-day racing efficiency & comfort Ultra-light & strong oversized FACT carbon rails that are smoothly integrated into the base Tough light & water resistant Micromatrix cover Sizes available 130mm 143mm & 155mm NOTE: Oversized 7x 9mm carbon rails are not compatible with seatposts equipped with side-load clamp mechanisms for 7mm round rails