you can't go wrong with a Shark RSI, its the best helmet i've owned. I ride an unfaired bike and and the Shark seems to cut through the air better and high speed, saving my neck muscles. Replacement shields are a little pricey at about 50 each. The RSI has a long oval shape, that fits my head nicely. With other brands I have to get at least 3xl or they're too tight in the front and back, my 2xl Shark fits perfectly.