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Old 01-28-2013, 07:12 PM   #5 (permalink)
smokebelch109
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Join Date: Nov 2012
Location: London - UK
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Straight from the smith website and plenty of other sources. the 5x refers to the fact that they made it 5 times bigger.

'A hydrophilic chemical treatment creates a micro-etched surface on the inner lens to absorb moisture before fog can form. Because Fog-X is a treatment that is actually burned into the lens, it can’t be wiped away like other anti-fog coatings.'
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