They've worked well for me, although I can't say I've had them out in really cold weather to date. Probably the lowest was 0F or so. They are pretty good for hiking, especially for pack boots. I bought them after hunting in -20F weather for a few years and since I have owned them, I haven't seen that severe cold again. I would think they would do well for your wife, especially if you are sitting quite a bit.
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