Using the Bell Lil Ripper helmet is a breeze. First, choose the right size for your child, either the Universal Toddler (XS: 45–51 cm) or Universal Child (SM: 47–54 cm). Then, adjust the fit system to make sure the helmet fits snugly on your child's head. Use the no - pinch side buckle to secure it. When your child is riding, always ensure the helmet is properly fastened. As for maintenance, clean the helmet with a mild soap and water. Don't use harsh chemicals as they might damage the helmet. Store it in a cool, dry place when not in use. And remember, replace the helmet if it has been in a crash, even if there's no visible damage.