Every now and then I come across a car that has parts of its front covered in a leather-like tissue. Finally, I have learned that these things are called front-end bra or front-end cover. The linked Wikipedia article also has some discussion about the rationale behind this cover and how useful or not it is.
However, most of the covers I see also have two protrusions consisting of the same material basically folded up to a triangular shaped bar, as can be seen in the image below (source):
Unfortunately the Wikipedia article does not explain what those protrusions are for. The only thing I could imagine is that they are thought as some kind of wind deflector to keep the wind shield cleaner and/or provide better functionality of the wipers at higher speeds. Am I right with this idea or is it something else?