After a good motor ride do you still have the feeling being on the highway? During motorcycling hair cells in the ear get to endure a lot of noise and there's not enough time to repair. After riding do you have a beep in your ear, then you can take for granted that some hair cells have died: a definitive hearing damage. Alpine hearing protection can help you prevent this. It's dangerous when you're completely isolated of your environment and the traffic that surrounds you. Also you do want to keep hearing your motor! This is the reason Alpine hearing protectors have special filters, that filter only harmful wind noise.