The Kask Protone Icon helmet features the latest technological advances in safety, ventilation, and aerodynamics to make it an icon of road cycling. The Protone Icon takes its design from KASK’s winning Protone helmet and has improved upon it in every way possible. Like all KASK helmets, the Protone Icon has been developed in accordance with the KASK WG11 protocol, an objective, scientific approach to measuring the helmet’s performance against rotational impacts. The Protone Icon utilizes seamless technology, joining the lower and upper parts of the shell to create a refined and super-elegant look. The new over-injected rubber dial provides improved finger grip. The vertical stabilizer has been redesigned for greater stability providing a customized fit for riders with long hair. The ergonomic neck support ensures a fast and secure fit against the back of the head. The innovative inner strengthening frame offers greater mechanical strength and better compactness. In case of shock, it prevents the helmet from breaking into many pieces, allowing greater safety for every rider. Includes a removable and washable inner padding in Coolmax material. Sizing: (Measure head circumference around temples) Small: 50-56cm Medium: 52-58cm Large: 59-62cm