What are the key factors to consider when selecting aero bars for long-distance triathlons, and how do you prioritize comfort, aerodynamics, and adjustability when making your choice? Are there any specific features or technologies that are must-haves for a triathlete looking to shave precious seconds off their time, or are there other considerations that should take precedence? Additionally, how do you determine the ideal width, shape, and rise for your aero bars to maximize power output and reduce fatigue over long distances?