There's technically no one specific time of year to wear hats. It's a year-round accessory—esepcially baseball caps—but once the cold-weather season rolls around, it becomes a staple piece to ensure our noggins and ears stay warm and toasty (and are protected from the frigid wind chill). Because it's an accessory we wear almost nonstop during this time of year, a hat can quickly collect dirt and oil from our hair and from the debris floating in the air. So cleaning it every once in a while is also very important. But what exactly is the best way to wash a hat? Of course, this depends on what type it is (and its material). Below, we break down exactly how to launder a baseball cap and a knit hat. Read on for an easy-to-follow washing guide and then shop our favorite hats for the season ahead.