The Sidi T-5 Air is designed specifically for triathlon. The upper weathers rain and water without losing stiffness, and the closure system is easy to adjust and reliable, the T-5 Air is particularly suitable for giving your best during triathlon competitions. -The highly secure hook-and-loop closure is simple but reliable, easy to adjust and fine tune, especially on the bike -The newly designed integrated heel cup is lightweight and reinforced to avoid deformations during strenuous rides -The Carbon Composite Sole 20 is composed of nylon and injected carbon fiber. The result is a light and rigid sole, which does not lose its characteristics when climatic conditions change or with the passage of time -The central part of the sole is graduated with milli-metric scale for precise cleat position and fine tuning -For walkability, Sidi cycling shoes include a replaceable polyurethane heel pad