The Fizik Transiro Powerstrap R4 is a sprint-focused triathlon shoe engineered for the fastest possible transitions and efficient power transfer. Its enveloping Velcro Powerstrap closure allows quick entry and secure fit, while a mesh and Microtex upper ensures breathability and support. The R4 carbon-injected nylon outsole balances comfort with pedal stiffness, making it ideal for swim-to-bike and short-course race formats.

• Enveloping Velcro Powerstrap closure offers intuitive, lockable fit adjustment for rapid transitions

• Mesh and Microtex upper provides superior ventilation with targeted support in every pedal stroke

• R4 carbon-injected nylon outsole delivers moderate stiffness for efficient power transfer in comfort

• Heel loop with rubberized finish aids in pre-clipping shoes to pedals and quick foot entry

• R4 outsole design includes ventilation channels to help control foot temperature

• Available in sizes 36–48 (including half sizes from 37–47) and color options Black/White or Black/Red