The Fizik R4 Overcurve is a Well-Ventilated, Micro-Adjustable and Form-Fitting shoe. Based on the classic Overcurve design, the R4 is designed for easy transitions into aggressive riding while maintaining balance. The outsole is moderately stiff, due to the improved design including infused carbon fiber without sacrificing comfort. Additionally, the single Boa IP1-B dial allows for easy on and off as well as quick and secure closure.