Hovding Invisible Bike Helmet
Protect your head and your hair by donning the Hovding Invisible Bike Helmet (4,000 Krona; roughly $600). This unique helmet serves as an airbag for cyclists, wrapping around your neck like an extra collar and using a gas inflator to pop the collar open and inflate the crazy, alien-looking airbag in roughly 0.1 seconds. Accelerometers and gyros detect accidents, sending 10 seconds of movement data to a black box for further analysis. Like any respectable modern gadget, it also features a rechargeable battery and charges/upgrades over USB.