Enhanced passive ventilation means the goggle frame has larger or more numerous vents with specially designed airflow channels. This setup encourages superior natural air circulation through the goggle without needing a battery-powered fan. It's the sweet spot for most serious skiers and riders because it offers excellent fog prevention while keeping things simple and lightweight.
This design is ideal if you ski in variable conditions or work up a sweat, as the increased airflow clears moisture before it can fog your lens. You won't have to worry about charging batteries or managing extra weight on your face.
The main trade-off is that the larger vents might let in a tiny bit of wind at very high speeds, but for most people, the fog-free vision is well worth it. Just make sure your helmet or beanie doesn't accidentally block those vents, or the system won't work properly.