Halfdome is an all-purpose bike helmet that folds in half so it can be stuffed into a backpack. Two latches on the side of the helmet allow the user to detach the top dome, turn it upside down and drop it into the bottom ring. This reduces the helmet size by half, which solves the storage and carrying problem that many users complain about when it comes to other helmets, and reduces the excuse for some users to not even wear a bike helmet at all. In addition to the convenient size-reduction feature, Halfdome sports a cool look so it’s appealing to all ages.