And right behind that, I'd say: beards.
As someone with a beard who is also trying to keep warm, imagine my delight when I stumbled upon this truly genius creation - The Beard Cap!
Ever wonder what you'd look like with a beard? What your boss, nephew, mom or girlfriend would look like?
Well, wonder no more, with this handy invention! Thanks to a brilliant Scandinavian designer named Vik Prjónsdóttir, Now you (or your mom) can stay warm all winter and still give passers-by a serious case of the chuckles, which will help them to keep warm also.
If you, or your mom, would like to purchase one of these amazing devices, you may do so for the bargain price of $130 (who can really put a price on warmth and beards though?) at a store called Scandinavian Grace, in Brooklyn.