GMax OF2 Helmet The Gmax Of-2 brings you all the great features from the Gm-2 along with some new ones like removable liners. The Of-2 is our most traditional 3/4 helmet. The five snap design allows for a variety of shields and visors to be installed. With adult and youth sizes available, the Of-2 is ready for affordable family fun. Features Removable, adjustable and washable Coolmax interior allows for easy cleaning and custom fitting 4 different shell sizes allow for a full range of fitment from youth to adult 3 snap visor 5 snap design allows for a variety of shields and visors to be installed DOT approved