Lint is one of those things that, when pressed, you might not be able to define it. But you know it when you see it—that soft stuff in your pockets that collects in the dryer and your belly button.

More lint in winter? Yep, it’s a thing. Here, experts explain why. Do you ever notice how during the colder months, your lint trap seems to accumulate even more fuzz than usual? Well, you’re not ...