Your engine is strong. What if we told you that you can make it stronger with a new set of pistons? These pistons we speak of are Fizik's R4B Donna shoes.
Sporting a minimalist, classic look that's packed to the gills with exceptional features, the Fizik R4 Donna Boa shoes are anything but ordinary. Instead of using the conventional ratcheting buckle like the majority of shoes in this range, the R4 employs their innovative closure combination of a single Boa IP1 and Extended Power Strap that not only allows a quick and easy adjustment, but also creates more points of engagement which provides an overall more precise retention and fit. This firmer hold on the foot eliminates uncomfortable pressure points on top of the foot and efficiently controls interior volume, allowing each pedal stroke to harvest the power of your entire foot. Further augmenting, the injected composite carbon vented outsole plays a big factor in keeping weight minimal and providing an insanely stiff platform for soul-crushing accelerations and leg-ruining attacks.
Looking to the exterior, the R4's upper is suited with Fi'zi:k's laser perforated Microtex material for efficient cooling and prolonged durability. The Velcro strap employs Sail Cloth resistant material which is made to hold its own against the harsh ocean environment, meaning they don't stretch, fade or fatigue. Comfort is further optimized by the Fi'zi:k Cycling insole which is ergonomically padded with traditional EVA foam to reduce pressure on the arches and at other contact areas of power transfer.
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