Designed for Everyday: The Strada’s understated style makes it a versatile choice for any ride. Find your size: Measure the circumference of your head 2cm above your eyebrows (about the width of a finger). Once you have your head circumference, use our size guide to select the correct size based on the model helmet you are interested in. If you are between sizes, we recommend that you select the smaller size helmet Precise Fit Comfort: Advanced ScrollSys fit system cradles the skull while allowing intuitive, quick adjustments for a precise, stable fit The Power of Cool: massive ventilation channels supercharge airflow through the helmet to enhance cooling Full Size Range: S 52 – 56cm, M 55 – 59cm, L 58 – 61cm, XL 61 – 64cm Guaranteed fit, premium ventilation and top rated protection. Strada KinetiCore is ready for adventure.