SkiVision Cold-Weather Anti-Fog Spray

Built specifically to handle the extreme temperature swings skiing involves — going from cold outdoor air to warm indoor lodges repeatedly throughout the day, which is exactly the kind of condition that causes heavy fogging. It holds up reliably through a full day of this kind of temperature cycling. For everyday glasses use in normal conditions, a general-purpose spray does the job just as well for less money, so this is really best suited to its specific winter sports use case.