4-position harness points -- Allows you to move the harness forward, backward, up or down - allowing for the most optimal position for ultimate comfort. Vented pressure pad keeps the straps in place providing an additional level of comfort. Easy to grasp triangle knob Adjusts the suspension from 6.5 to 8 inch hat sizes. Swinging hinge points allows you to find the most comfortable position on the back of your head. Meets ANSI Z89.1 Standards, Type I, Class C, CSA Z94.1-15.