Winter hats are a must-have when the weather gets chilly. Leaving your head exposed is a problem no matter how warm the rest of you might be—it's like turning the heat on high inside your home only to discover that somebody left a window open. No amount of warmth can make up for leaving a window open, and no amount of warm clothing can make up for letting heat escape through your head. That's why choosing a top-notch winter hat is vital for both men and women.