01. Upon inspection I liked the design and finish of the helmet, and the polycarbonate shell was beautifully matched to the pivoting chin bar with a secure-feeling stainless-steel-latching mechanism. When I first slid the XL helmet on, it seemed to fit my 7 5/8-inch head very well. It wasn’t too egg-shaped or too round, but just a good ergonomic profile. After I rode a few miles, I started to test the features of the helmet out at 55-plus mph. The first thing I noticed at that speed was it seemed like the N90 was less noisy than most other modular helmets I have tested and really stable with very little buffeting even at higher speeds in excess of 100 mph.