Using the Bell Nomad helmet is a breeze. First, adjust the Ergo Fit system with one hand to fit your head size between 53 - 60cm. Make sure it's snug but not too tight. When riding, ensure the helmet sits level on your head. For safety, always wear the helmet every time you get on your bike. When it comes to maintenance, clean the helmet regularly with a mild soap and water. Avoid using harsh chemicals as they can damage the helmet's material. After cleaning, let it air - dry naturally. Also, check the helmet for any signs of damage, like cracks or dents, before each ride. If you notice any, it's time to replace your helmet for your own safety.