I need some sunglasses for when I’m driving, and I don’t really have any idea what features I need, or what is completely useless. E.g., is polarizing actually useful?
I’m willing to put into it about $50-$60, but I have about $20 at Sunglass Hut.
I also could use some style suggestions… 
I’m mostly looking for something smooth, and relatively plain. Nothing with gold and yellow hearts.