A system and a method for protecting the head of a user in case of an abnormal movement, such as a fall or a collision. The system comprises an apparel (1), an airbag (2), an inflator (3), and a trigger. The airbag includes a first part (7) for surrounding the neck and back head portion of the user after inflation, and a second part (8) for forming a hood surrounding the skull of the user after inflation. The first part (7) and second part (8) are folded and arranged in the apparel (1) before inflation. The apparel is arranged around the neck of the user, like for example a collar or a scarf.