The Solara is built around the same performance fit as Giro's top shelf competition shoes to give you the same pedaling efficiency as the pros. It's also made with premium, high performance materials. Giro knows where to make slight compromises, however, so that it can make a high performance road shoe available at an extremely reasonable price. The first area where Giro was able to lower cost is the upper material. Instead of using one of the costly microfibers that its much more expensive shoes use, Giro opted for tough, breathable microfiber. This is a more basic microfiber than Evofiber or Teijin, and it gains a few grams because of that. Also, instead of an expensive EC90 carbon fiber outsole, the Solara uses Dupont Zytel nylon, which creates an efficient pedaling platform, but isn't quite as stiff. Many riders feel, however, that the slight loss in efficiency at the pedal is worth the gain in comfort that Zytel provides. Other features of the Solara include a ratcheting third buckle for precise fit control. You'll notice this same ratcheting buckle on many of the pros' shoes. Giro also treated the Solara with Aegis antimicrobial to fight odors.