Using the helmet is easy. First, adjust the head basket to fit your child's head comfortably. Then, fasten the side buckle on the cheek to secure the helmet. When riding at night or in low - light conditions, attach the Universal Lazer LED at the rear to increase visibility. Remember to check the fit of the helmet regularly as your child grows. Avoid dropping the helmet from a high place or exposing it to extreme heat or cold, as this may damage the protective structure. To clean the helmet, use a mild soap and water solution and gently wipe it with a soft cloth. Do not use harsh chemicals or abrasive materials.