Using this Smith Wilder Jr. helmet is easy. First, put the helmet on your child's head. Then, use the VaporFit dial system to adjust it until it fits snugly. The visor can be left down to block glare from the sun. When your child takes off their sunglasses, they can store them in the integrated storage. As for maintenance, clean the helmet regularly with a mild soap and water. Avoid using harsh chemicals as they might damage the helmet. Make sure to dry it thoroughly before storing. Check the helmet for any signs of damage like cracks or loose parts after every ride. If you notice any issues, it's time to get a new helmet.