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a colleague mentioned she had seen something about this on the tv or something, so naturally i had to have a look....turns out she was right!!
[url= http://gearpatrol.com/wp-content/uploads/2012/08/Hovding-Invisible-Helmet-Gear-Patrol.jp g" target="_blank">http://gearpatrol.com/wp-content/uploads/2012/08/Hovding-Invisible-Helmet-Gear-Patrol.jp g"/> [/img][/url]
made by some Scandinavian company (i think that explains a lot), but honestly, who would actually buy one especially at £399 a pop?! its a use once item as well!!
by the looks of the image above, activation of the helmet also gives you a sex change!!
more info at http://www.hovding.com/en/
Yay !
Inflatable helmets again 
This one looks cooler.
Just the thing for that there Laaaahndahn.
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Neal Stephenson was writing about them in Snow Crash in 1992.