found a helmet i liked on sale but the only one left was the display one on the shelf left (naturally)... is it safe to buy? considering it may have been dropped in the course of being tried on by hundreds of people? also, what exactly is the "correct" fit for a helmet? is it meant to be almost uncomfortably tight when you first put it on so that once the padding is compressed it will be a better fit? I was told that it should be tight around the mouth but you shouldn't feel any pressure around the crown of your head, does that mean the padding around the top of your head never compresses?