Introducing the Hövding! This "stylish" collar actually takes the place of a cycler's helmet, and acts as an airbag that inflates on impact. In the event of a crash, the Hövding deploys itself by inflating an internal airbag in less than one second, covering the head and protecting the skull from injury.
This short video explains the product in a little more detail:
So, for those that don't wear helmets while riding, would you wear one of these? Would you trust them to actually work?