Using the Bell Lil Ripper helmet is a breeze. First, choose the right size for your child based on their head circumference. The Universal Toddler size fits 45–51 cm, and the Universal Child size fits 47–54 cm. Then, use the Action Fit system. Just turn the dial to adjust the helmet until it fits snugly on your child's head. The no - pinch side buckle can be easily fastened, even if your child is moving around. When your child is riding, make sure the helmet is centered on their head. As for maintenance, you can use a mild soap and water to clean the outer shell and the liner. Let it air - dry completely before the next use. Check the helmet regularly for any signs of damage, like cracks or loose parts. If you notice any issues, it's time to replace the helmet. Always keep the helmet away from extreme heat and direct sunlight to avoid damaging the materials.