Using the Raskullz Shark Attack Child Helmet is easy. First, adjust the nylon straps to fit your child's head size between 50 - 54 cm. Make sure the helmet sits comfortably on the head. When your child is riding, always ensure the helmet is securely fastened. As for maintenance, you can use a mild soap and water to clean the outer shell and the straps. Let it air - dry completely. Remember, this helmet is for children aged 5 - 8, so don't let younger or older kids use it. Check the helmet regularly for any signs of damage, and replace it if you notice any cracks or significant wear.