If you didnt know, all helmets are now rated by a government agency. 1-5 stars, 5 stars the best. You may be shocked to learn that your mega expensive helmet is actually a piece of sh!te!
My AGV Stealth SV is rated at 4 stars. :eusa_clap
Have a looky here
http://sharp.direct.gov.uk/
Not reliable or accurate testing though.