I use my earplugs anytime I will be doing more than a few minutes of riding at highway speeds or above. The wind noise for any lengthy period is far more damaging than my open lid airbox, or my Guzzi Ti pipes. I ride in a Shoei RF 1000 which has proven to be a relatively quiet helmet, but even a Schuberth S1 rates at around 90 decibels at 65mph. I dont like normal earplugs on the bike because they block out too much ambient noise which I think makes them dangerous to wear in traffic. I have tried several disposables, and non-disposables with rating from 24-30 NRR ratings, and I had the same feeling with all of them. Because of this I wear a Bilsom 656 NST. I like these because they are only rated at 21db NRR, and they have channel which passes throung the center of the earplug so that some mid and high frequencies pass through. I get more than adequate protection with these, and I can still hear most of the ambient traffic noise that I need to hear like ambulances, horns. These are really nice compared to a conventional earplug.