Skydiving is not about what's safest. If it were, we wouldn't have so many landing deaths and injuries, because we wouldn't have the canopies that make them more likely, and we'd be wearing something closer in protection level to a motorcycle helmet, rather than hardhats which have less padding for a larger head than for a smaller head, making up the size difference with thinner liners. Helmets didn't go from less effective to more effective. When I started skydiving, hard helmets were required, and that meant open faced motorcycle helmets for any experienced jumper. I seem to recall that students were put out in football helmets, with no faceguards. A few years later, when the hard hats were removed from the BSR's, people moved to hockey helmets, water polo helmets, later to Protecs, then to nothing or frap hats. The modern hard hats offer better head protection than the frap hats, and offer some face protection from moderate impacts, although all I've jumped restrict my downward vision. When we Protec-wearers first saw frap hats, we surely weren't gonna wear one of those dorky things! A year later, we all had them. I've had many hits to the head from feet, aircraft doors, ground, while wearing a frap hat, and there is no doubt that it is significantly better than wearing nothing.