We freaking adore Wikipedia:
"In parts of Canada and the United States, a beanie refers to a head-hugging brimless cap with or without a visor. Seamed beanies are made from triangular sections of cloth joined by a button at the crown, and seamed together around the sides. They can also be made from leather or silk panels."
Wear a beanie to keep warm or to be cool. Either way, this one happens to have our logo on it.