La Sportiva Glacier: Insulated? Warm?

I'm thinking about trying some La Sportiva Glacier mountaineering boots. The product descriptions don't mention any insulation. Has anyone here used them or otherwise know about whether they're insulated, or suitable for long, cold
weather hikes. In this case, let's say that means no colder than Zero F.
One user review said they were warm at 2 degrees F, but he didn't say how long he was out, or how strenuous his hike was, or if he's one of those people whose feet tend to stay warm anyway.
Thanks.
Mark

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