At first I thought it was a joke. But no it's for real, and quite ingenious. I would imagine its' application to MTB'ng cannot be too far off. Could be integrated into a Camelback I would think? Something to protect the kidneys and abdomen would be nice...
However not sure how cost effective it would be vs a good old plastic helmet.
<iframe src="http://player.vimeo.com/video/43038579" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen="" frameborder="0" height="281" width="500"></iframe> The Invisible Bicycle Helmet | Fredrik Gertten from Focus Forward Films on Vimeo.
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Thread: Invisible Bike Helmet