A girl can never have too many sunglasses. At least, that seems to be the prevailing mentality of fashion labels, who are keen to emblazon their logos on anything wearable. The newest shade convert, Theory, is (unsurprisingly) not about flash but about function. Cool function, of course, with aviators and Audrey-approved shapes in gray, blue, black, and tortoiseshell. They will be available in Theory stores nationwide from April 15. Prices run from $200 to $240.