Why does my helmet fog my goggles, and how can I fix it?

Goggle fogging is usually caused by warm, moist air from your head reaching the cold goggle lens. To prevent it: (1) Open your helmet vents to allow warm air to escape through the top rather than out the front, (2) Ensure there is no gap between your helmet and goggles that allows breath to rise into the lens, (3) Make sure your goggles are not too tight against your face, which restricts airflow through the goggle's own ventilation, (4) Avoid putting wet goggles on a warm forehead during lift rides. Adjustable helmet vents are your primary tool for managing this.