* The S-M10 helmet shell sizing solution ensures that each helmet size has its own matching shell size to provide the most anatomical solution for the most diverse fit needs around the world. Four different helmet shell sizes (S, M, L and XL) and six consumer sizes (XS to XXL) ensure that the rider has the right fit, which not only improves comfort and reduces overall weight, but more importantly increases the helmet's effectiveness in the event of an impact * The patented A-head adjustment system allows easy adjustment of the angle and height at which the helmet sits on the head * Ultra-ventilated helmet with 28 individual inlets and outlets, excluding the eye opening, with 18 inlets and 10 outlets, for optimal ventilation