i must've tried on about 10 different helmets today. the best fit came from the icon mainframe (large). anyone have any personal experience/advice on these helmets? they're a bit short on features: non-removable lining, vents are kind of hard to operate, no snap for chin strap, but they make up for a lot of that with price. all things considered, i'd rather pick up another arai, but i can't find one that fits well. large is too small, x-large is too big.