Question TUSA Anti-fog "Freedom Film," Anyone used them?

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BoltSnap

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I have used them and would have sworn it was a $15 gimmick. I was so wrong. Those little gems do exactly what they are supposed to. I have had a set in my mask for about 2 years now. I have a friend of mine that has never been able to keep his mask fog free. I suggested he try them. He absolutely loves them. We both dive colder waters of the Midwest with a wide margin of temp difference from face to quarry water....main reason we both tend to fog. They are great.
 
here in New Zealand they cost $110nz
in the spirit of no8 fence wire - does anything else work - like phone screen protectors
 
https://www.shearwater.com/products/perdix-ai/

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