The Empire Thermal Lenses are the replacement lenses when the original ones are cracked, scratched or have lost it's anti-fog ability. Still utlilizing the same quick change lense system that all Empire masks feature, these lenses will only work for Empire/Invert masks. The Thermal lense design is the best soltuion for fogging issues with it's unique design. Using a dual pane lense the air pocket inbetween the lense will help prevent a dramatic temperature difference that can cause condensation (fog) within the mask.
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