Using this mountain bike helmet is easy. First, adjust the 360 - degree head belt vertically to fit your head size. Then, use the Safe - T Heta fit system to fine - tune the fit. The Fidlock magnetic buckle makes it simple to put on and take off the helmet with one hand. When riding, you can adjust the visor according to your needs and dock your sunglasses in the front vents. Remember to always wear the helmet correctly, with the strap under your chin tightened properly. For maintenance, clean the helmet with a mild soap and water solution. Avoid using harsh chemicals that could damage the materials. Store the helmet in a cool, dry place when not in use. Don't expose it to extreme heat or direct sunlight for long periods as it may affect the integrity of the helmet.