An open nose balaclava has a cutout around your nose that lets exhaled breath escape naturally instead of getting trapped and rising into your goggles. If fogging is your main frustration, this design virtually eliminates it—your warm breath goes straight out rather than bouncing off fabric and up into your lenses.
The trade-off is coverage. With your nose exposed, you'll feel the cold more on that area, especially in bitter temperatures or high wind. It's a great choice for milder resort days, spring skiing, or if you wear glasses under your goggles and need that extra airflow.
Skip this option if you're riding in extreme cold or backcountry conditions where full face protection matters more than fog control. You can always pair it with a neck gaiter for customizable coverage on chillier days.