The Prologo U-Cage has everything you need for your long distance Triathlon race/training. This is one of the lightest rear hydration systems you can find, thanks to the carbon injection structure. Not only will you be able to keep your hydration here, but you can store your CO2, energy food or gels. The revolutionary system, solid, stable, allows you to mount one or two bottle cages. The structure aerodinamically designed and tested in the wind tunnel eliminates the whirls and reduces air resistance.