It's so cold you have to duck when you walk down the street to block the wind from freezing your face. Oh wait, then your head's iced over. You know what'll keep it warm? This all merino wool knit cap from Best Made.

This cozy hat gets its cred from tests on the frigid streets of New York City and snowy mountains of St. Elias National Park in Alaska. Both cold places, both places where you're screwed without a some head protection. A hat makes you instantly warmer. When you're comfortable and toasty, nine degrees with a wind chill isn't as bad. [Best Made]