How does the mask fit effect fogging?

Question:

How does the mask fit effect fogging?

From Mask Buyer’s Guide:
“If a mask fits poorly, you will have to contend with leaking, fogging, and other discomfort. ”


Answer:

The leaking associated with a poor fit often adds to fogging problems.  The leaking water washes your anti-fog solution off the inside of your lens and in turn increases fogging.

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