[JoeProBono]

http://www.hovding.com/how_hovding_works

[Svartalfiar]

Hmm... Interesting but I see several weak points. Also, there's no actual description of how it works, just that they've done a bunch of testing to compare regular biking/bending over with actual crashes. Doesn't look especially comfortable either.

In the highly unusual category of cycling accident where no measurable movement appears within the cyclist, i.e. if an object falls from above straight down on the cyclist's head, Hövding will not react.

Unusual, but still happens. Or whacking your head on a low tree branch.. Or getting run into by a vehicle: the helmet may not help until after you've been hit and thrown.