To use this Lazer Maze Jr Kineticore BMX Helmet, just put it on your head and adjust the straps until it fits snugly but comfortably. Make sure it sits level on your head. When you're out riding, always wear it properly to stay safe. As for maintenance, you can use a mild soap and water to clean the helmet's exterior. Don't use harsh chemicals as they might damage the helmet. After cleaning, let it dry in a cool, shaded place. And remember, if the helmet has been in a serious impact, it's time to replace it.