Everything you need
The Giro G10 MX is a nicely weighted helmet. Light enough that you'll barely notice it's there, but heavy enough to take a whack and come back for more. I used to wear a Leedom Scream and the weight difference is incredible along with the comfort of the 3/4 shell. I've added the TuneUpsII kit and that turns it into a pretty sweet sound system as well. The only thing about it is the visor. I like it for crashing through branches and keeping the trees ugly mitts off my goggles and face, but I can see how it would be unnecessary weight for a lot of people. Vents well, but not as warm as my old Leedom, but that's when I was in 0F Maine weather. I've never been cold with the G10 here in Utah.