Really random question but I keep seeing people with these things fitted to their cars and its bugging me what their actual use is.
It looks like its made from flexible material, is about a foot across. Kind of looks like a big black elastic band around the bonnet. It then has 2 little flaps on it, one kind of inline with each font seat of the car.
I have no idea what its called so google is useless!:o)
Anyone know what the use of these devices are? I had concepts of it being an areo device to improve flow over the car but suspect its my F1 geekyness getting away with me.