Using your Ripper Junior MIPS Mountain Biking Helmet is easy. First, put the helmet on your head and adjust the Occigrip turn - dial system until it fits snugly. Make sure the helmet covers your forehead properly. When riding, always wear it securely. As for maintenance, use a mild soap and water to clean the helmet. Avoid using harsh chemicals as they might damage the helmet's materials. Check the helmet regularly for any signs of wear and tear, like cracks or loose parts. If you notice any issues, it's time to replace the helmet. And remember, this helmet is for biking only, so don't use it for other activities.