Before we get into the prevention, we've got to understand the creation of these rings. "It's more or less intuitive, but it's caused mostly by sweat," Kerr explained over the phone. "If you live in a city, the grime will lead to rings around the collar. Dead skin and the natural oils from your body rub onto the collar of your shirt that leads to a buildup of yellow and brown dingy muck. City grime is a part of that, too." She also cautioned that if you have long hair, any product you put in it will exacerbate the issue. Hearing her actually describe what was up was enough to make me set my shirt collar on fire, which seemed drastic, so we then talked prevention.
So instead of setting your shirts ablaze in a farewell-to-summer bonfire, just arm yourself with the appropriate products and a little bit of effort. Your shirts will thank you.