Here’s an example from about a month ago, showing the fogging that can occur when it is cold, and your breath is directed upwards by a covering over your mouth. When is is really cold, the fog can also start freezing to your glasses.

North45 is a company that sells balaclavas that claim to eliminate fogging of either ski goggles or glasses when you otherwise need full facial protection from the cold. I got one of their balaclavas for Xmas, but until yesterday it really wasn’t cold enough to put it to the test.
The model that I got is meant for glasses rather than ski goggles. Here is what it looks like from the side. It is a medium weight merino wool balaclava with an extra band of cloth.

When you bring this band down to the correct position, then it covers the lower half of your face, and the top edge of the band has a bit of wire or metal that gives a good fit around your nose.

This is what it looks like in operation. Bottom line: no fogging of glasses.

It is gets too warm, it is easy to pull the band down to your chin. Also, the fact that it is merino means that if it gets a big soggy from your breath, it will still keep you warm, and in fact the flap stays further from your face than a regular balaclava.

The reason it works is that the band is open at the bottom so that your breath is all directed downwards away from your glasses. I can imagine rigging up something by taking an N45 mask, cutting big vents in the bottom, and combining it with a balaclava to get much the same affect, but it wouldn’t quite provide the same level of protection when it is really cold.
At any rate, it is a high quality item. It is made in China, but buying it supports a small company in the Canadian Rockies. From the postal markings on the package I see that mine passed through both Lake Louise and Canmore AB.
Here’s to hoping that I’ll actually not using it much this winter. At -9°C yesterday and this morning, it was too warm.
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