Aerodynamic was one of the idea behind the design as this helmet which replaces the previous type called the Airoh Tyger http://www.bikingdirect.com/product/...er-helmet.html The Tyger was slightly noisier and bulkier, I have both and this one seems to be a great improvement from the previous, but don't forget any lid with a peak is bound to catch wind and at high speed (90mph+) it does tend to hiss when the wind is caught under the peak, I know of a lady who used to wear an Arai Tour X on her streetfightered fazer 600 and ended up with whiplash on her neck which her doctor blamed to the lid with a peak she was wearing. Therefore its not just Airoh that causes turbolence but Arai, HJC, or any other helmet with a peak.