Keith wrote:So a "force field" then basically?
Hmm... you'd have to take a very interesting approach to this... might be able to pull it off, but the power source to run it would probably be too extreme to carry around.
What might be another way around this problem?
If such a 'Force Field' were possible beyond the realm of SF any one of the defence labs around the world would have done it by now. It would have also find its way to mall entries.
PerhapsThe closest approach realizable immediately, is an air curtain used at mall entrances to keep out dust and keep in airconditioning. But as you say, the equipment will be heavy, unwieldy, and expensive.
Going on from the name 'Invisible Umbrella' suggested by soul, why not do just that? There are many very transparent, very tough polymers developed for aero-space applications. One can design a head worn thin (almost invisible) umbrella that can come down a little below the shoulders, yet leave the hands free.