The Fizik R4 Overcurve is a versatile road bike shoe for men which has been designed for a wide range of cyclists. The Overcurve shoe construction has a staggered collar that wraps around the ankle, tracing the alignment of the two bone protrusions: the lateral and medial ankle nodes. This results in an asymmetrical construction which ergonomically conforms to the foot’s anatomy. The BOA IP1-B locking system allows the fit to be adjusted quickly and easily by a simple turn of the knob. This locking system can even be used easily and responsibly while cycling.