Unless you're hucking 120 foot cliffs (and even then), you don't need a full face. Seriously, if you're worried about some bulky thing messing up your groove, get a Smith Maze, super light weight, but like mosty all helmets, it's single rated for crashes. Since you cant really tell if a helmet is done or not after a crash, it can be structurally damaged, and you wouldn't know. Don't get anything like a Bern Hard Hat, those aren't certified, but their EPS foam is. Don't get something crap for park, look at all the injuries that have happened in the past year, you don't want to be next by not getting the proper helmet.