The Fi'zi:k R4 Transiro Powerstrap is a triathlon shoe designed for shorter-distance races. It features an intuitive and quick Velcro closure system, making it ideal for sprint or short-distance triathlon formats where every second counts in transition. The Powerstrap is easy to fasten - simply slide into the shoe, pull, and roll out from the transition smoothly. Its design pulls an extended area of the shoe's upper, ensuring a secure and enveloping fit. The Powerstrap can be locked in the wide open position for easy foot entry during transition. The heel is equipped with a rubberized loop to facilitate setting the shoes ready to be clipped into the pedals. The shoe's upper construction combines mesh and microtex for superior ventilation and appropriate foot support. The upper is complemented by a moderately stiff R4 outsole, providing a balance between comfort and pedaling efficiency. The outsole also offers efficient ventilation for temperature control. The Fi'zi:k R4 Transiro Powerstrap has a mesh and microtex upper, an R4 carbon injected nylon outsole, and a weight of approximately 508g.