Using this Nutcase Little Nutty helmet is easy. First, choose the right size for your child, either toddler or youth. Put the helmet on your child's head and adjust the grow flex fit system to get a snug fit. Make sure the no - pinch magnetic buckle is fastened securely. When your child is out using the helmet for any sport, always remind them to wear it properly. As for maintenance, use a mild soap and water to clean the outside of the helmet. Don't use any harsh chemicals as they may damage the shell. Check the helmet regularly for any signs of wear and tear, like cracks in the ABS shell or damage to the foam. If you notice any issues, it's time to get a new helmet. And remember, this helmet is for kids aged 3 and up, so don't let younger children use it.