The R4B features Volume Control Technology and the Extended Power Strap for quick and easy adjustment to create perfect fit for comfort and performance. Fizik uses the Microtex upper throughout its lineup, so your fingers will move under the same perforated synthetic leather upper as the professionals who wear the R1B. Flexible and light, the material is stronger than it seems. Rely on it to heat road sand and unexpected showers gracefully while using the BOA dial and two hook-and-loop straps to secure it around the contours of your foot for a slip-free fit. Beneath the shoe, a carbon-injected synthetic outsole blends some of the stiffness of carbon with the durability of nylon for reliable power transfer. Inside the shoe, Fizik includes its cycling insole, molded to provide support for your hard foot as you expertly rotate the pedals next to the heel cup. A synthetic injected carbon sole blends some of the stiffness of carbon with the durability of nylon for reliable power transfer. Inside the shoe, Fizik includes its cycling insole, molded to provide support for your hard foot as you expertly rotate the pedals next to the heel cup. A synthetic injected carbon sole blends some of the stiffness of carbon with the durability of nylon for reliable power transfer. Inside the shoe, Fizik includes its cycling insole, molded to provide support for your hard foot as you expertly rotate the pedals next to the heel cup.

Specifications:

• Materials: Microtex
• Outsole: UD Carbon Fiber
• Closure system: Boa IP1-A, micro straps
• Insole: Fizik cycling Insole
• Weight: 8.96 oz