Fi'zi:k knows that triathlon shoes play by a different set of rules. Your time can't be wasted on ratcheting buckles, and your feet can't be berated by an ultra stiff outsole. Basically, triathlon shoes require a system of compromises, yet speed and comfort must still play a vital role. Well, the Fi'zi:k K1 Uomo Shoes have all of these bases covered. With a custom moldable insole and a stiff, yet compliant, carbon fiber outsole, the K1 checks off all of your boxes for a perfect triathlon shoe. At the uppers, Fi'zi:k used a material that we don't see in use very often with cycling shoes neoprene. We know what you're thinking, how hot is it inside these shoes The answer Not hot at all. In fact, aside from the ample perforation and ventilation panels, this material is highly breathable. It was used over the Fi'zi:k standard, Microtex, for its water resistance and ease of entry with wet feet. So, your transition from sea to land won't be slippery. To further control slippage, the K1 Uomo has shaped the heel cup at the aft position of the shoe. This feature keeps the foot in the perfect position on hard up strokes and while climbing out of the saddle. As a result, you're powering the pedals comfortably and efficiently. This has been further heightened by Fi'zi:k's variable stiffness sole construction, called 3D Flex Carbon. The base is comprised of an ultra stiff carbon fiber plate, with second layer being positioned closer to the heel. This layer is constructed from a material called Tepex that's a little more malleable than the carbon fiber in order to accommodate and support multiple heel and arch sizes. Together, the multiple layers work hand in hand with the insole and upper to keep the heel in place and to maximize comfort. And even better for triathletes, the outsole has been design to allow a good deal of lateral flex. So, your feet will experience less fatigue, maximizing your run potential after T2. And on the subject of the K1's comfort, Fi'zi:k has...