NickMwrote a review of Black Diamond Vector Helmet on October 9, 2015
Familiarity: I've put it through the wringer
Buy something else. Yes, it's light, but super fragile. Sure, all beer-cooler foam helmets are fragile, but this one is terrible. They made lots of vents in the back, which is nice, but that created thin, delicate spans of foam that easily break. Other companies offerings use the same, weak foam, but have a much stronger design. I've used this a lot skiing and climbing and have never really smashed my head. Foam has cracked and broken from getting shoved around in a backpack, dropped, etc.