Prologo nago evo tri40 tirox saddlea semi round saddle designed specifically for triathlon riding new ti rox rails made from alloy steel highly resistant to traction and torsion and a great balance between lightweight and high strength active density varying pad densities along the saddle meaning better comfort and better pedal strokes shape semi roundend use triathlonlearn more with the prologo buying guide featuressize mm 280x135weight gr 199base carbonfibre injectionrail tirox