Do not overdress. Be warm, but not too warm. Exercise, skiing, or any movement generates heat and if sweat is forming on your forehead, your goggles fog up. Take off a few layers until you are comfortable.
Snow. If it is snowing and your goggles begin to fog, check to see if the snow has clogged the vents. If they are covered, the heat cannot escape so do your best to remove the snow.

If your goggles do fog, never wipe them clean. Doing this reduces its effectiveness. Anti-fog treated lenses will heal themselves given time.

Never clean your goggles with glass cleaner...that removes the anti-fog coating and only use anti-fog sprays or liquids on your goggles when the factory anti-fog coating has worn off or been removed.

For glasses wearers, try putting on the goggles before leaving the indoors since this will prevent the glasses from getting cold. If snow/water gets on your glasses/goggles, blot the water droplets dry with a soft cloth. Even remove them and set them foam side down on your leg so the moisture-laden air can dissipate and the no-fog coating absorb the remaining moisture. Do NOT use chemicals or detergents to clean lenses that have an anti-fog coating. Use a soft cloth (like a micro-fiber cloth) to wipe clean.

**Please note that some of our eyewear already has the anti-fog coating, see the descriptions to be sure. However, there is always a possibility that these goggles will still fog-up depending on the situations as said above. Extreme conditions can also affect the anti-fog.