This competitive road saddle is contoured to position the rider for optimal power transfer & comfort while comfortably allowing them to sit in a low aero position; its Body Geometry channel maximises blood flow.> Patented Body Geometry design is lab tested to assure blood flow to sensitive arteries> Stiff carbon reinforced shell for longevity & all-day riding efficiency> Super-light EVA padding for comfort & support on longer rides> Lightweight & durable hollow titanium rails> Tough light & water resistant Micromatrix cover> Size 143mm/ Weight 254g> Size 155mm/ Weight 263g> Size 168mm/ Weight 270g