The goal of the Alpinestars Supertech family of helmets was to create the most advanced, protective, and performance-enhancing helmets possible for riders worldwide. With the S-M10, Alpinestars’ Helmet Development team engineered the helmet to offer the perfect blend of excellent ventilation, and unsurpassed comfort, to create a helmet with the lightest weight possible, all without compromising on any other front. The S-M10’s design offers a smooth, attractive, aerodynamic profile which is streamlined and free of any external channels and features that might act as a load point in an impact or compromise the overall integrity of the helmet’s construction. The surface curvature promotes reduced friction on impact, allowing deflection and the most efficient transfer of energy to protect the rider’s head from direct force to the skull and referred to the neck and spinal column. 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.