Sun glasses for winter that use thermal heat sink to keep from fogging?

Ha ha! a Moulder stip for glasses.

Check out XC ski shops on line for goggles that have vents and that don’t fully enclose your glasses (if you wear them). In other words they’re open on the sides. These work well for me. A bright tint works best in snow for adding definition.

@ YoPawn.  I think you need to determine where the moisture is coming from, and how it reaches the inside of your lenses.

I have a pair of Maui Jim wrap around sunglasses. The frame is plastic. The lenses are some kind of plastic.  Although wrap around, there is lots of space between my face the the bottom of the frame.

I have found that they fog up when I first put them on and or when my neck gaiter or other face covering directs exhaled breath up the bottom of the glasses.  In winter temperatures as low as 20, after I am outside for 30 or 60 minutes, I find the glasses very rarely fog up.

I have an old pair (several actually) of the same sunglasses I have currently in use, so maybe this weekend I will try melting some solid copper wire into the plastic frame.

I can just imagine putting them on after they sit out in -10 F and then realizing cold copper freezes to human flesh. :)

I always had good luck with the product called “Cat Crap”, when used as detailed by the manufacturer. It needs to be reapplied more often that I like, but it works pretty decent.

So, yeah, this might work if you leave your glasses on all the time, but at 15* F, when taken off just for a few seconds, they will freeze back to your skin. :)

I could possibly insulate the copper a bit, but then not enough heat would transfer.

It’s also hard to melt copper into existing sunglasses.

I had my eyes done for this reason, fogging was terrible with no good solution. I eventually got tired of it and had them done, wish I had done it sooner. Now I don’t even think about it.

Related and ultralight when it becomes commercially available –

https://newatlas.com/materials/anti-fog-gold-coating-glasses/

Dave

I’ve found the best thing is a tilting goggle (this one, for example). They are pricey, but effective. If they start getting foggy, you just tilt them up to let in more air. They are also handy for things like blowing your nose, putting on sunscreen, or checking the contents of a dark pack. Just flip it. I tend to anticipate foggy situations now. For example, I will sometimes clear out branches with a little saw. This means standing and sweating — the type of thing that fogs goggles. So I tilt them a bit in anticipation. But even if I forget I just tilt them a bit after and they dry out. This is on very humid days (e. g. Northwest slush — i. e. heavy precipitation right around freezing temperature). Those are tough conditions that used to fog up my goggles all the time (even with Cat Crap).