some helmets are quieter than others for sure, but mostly its the bike your riding, some have alot of air protection, some have little, some have more buffeting than others, also depends on the windscreen your running if one at all. seating position, height of the rider, etc. im a big shoei fan, and had a RF1000 for a few years, and the past 2 years i have been wearing the RF1100, i think they are pretty quiet, but more so they are comfortable. but going from one bike to the next, the windnoise differs.