No more excuses not to wear a helmet. The Plixi by the Parisian company Overade is a foldable helmet. The design of this helmet is a marvel – check out the video on their website – it folds into itself with various hinges and segments, so that its volume is about a third of the size of a standard helmet. This allows for quick and easy storage in your bag or backpack. The outer shell is made of ABS while the interior is made of polystyrene (great for shock absorption), and it meets European safety standards. Now, you really must wear a helmet!