Fogging is the number one complaint among skiers who wear prescription glasses. You start your run with clear vision — and within minutes everything turns cloudy.

So why does this happen?

The Real Reason Glasses Fog Inside Goggles

Fogging happens because of temperature difference.

When you ski:

• Your face produces warm, humid air

• The mountain air is cold

• Moisture hits a cold lens surface

Condensation forms instantly.

When you wear glasses under ski goggles, you create two lenses and trapped airflow, which increases fog risk significantly.

Why OTG Goggles Don’t Fully Solve It

OTG (Over The Glasses) goggles give more space inside the frame, but they don’t eliminate:

• Moisture buildup

• Restricted ventilation

• Double-lens condensation

This is why fogging often happens between your glasses and the goggle lens.

How Prescription Inserts Reduce Fogging

Prescription inserts sit closer to the goggle lens and eliminate the second external frame.

With:

• Better airflow

• Anti-fog coatings (like FogBlock Pro)

• More stable positioning

Fogging risk is dramatically reduced compared to standard glasses.

Final Thought

If fogging is ruining your ski days, the issue isn’t your goggles — it’s the double-lens system created by wearing glasses underneath.

Switching to a prescription insert often solves the problem at the source.

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