ABS material -- Strong, yet ultra-light for seemingly weightless protection. Low profile design -- Offers a low center of gravity for better balance. Rear padded suspension -- Provides additional level of comfort on the wearers' neck. 4-position harness points -- Allows you to move the harness forward, backward, up or down - allowing for the most optimal position for ultimate comfort. Replaceable sweat band -- Padded fabric and polyurethane foam for all day wear. Vented pressure pad -- Keeps the straps in place providing an additional level of comfort. Easy to grasp knob. Adjusts the suspension from 6 1/2 to 8. Swinging hinge points. Allows you to find the most comfortable position on the back of your head.