Any idea how they insulated the tent?
They called it a "four-season" tent, and it had a stovepipe coming out the top. They didn't show the inside. Wood (presumably for the stove) was nearby. No mention was made of how the tent was insulated.
I thought I heard "insulated" but I could be wrong.
No idea how one would go about insulating a tent other than pitching one inside another or building it out of lined material.
The material of the tent could itself be slightly insulated - either foam or some "bubble wrap" type lining.
Then again, probably the several feet of snow would keep it decently insulated. Depending where it was situated, if there was a wind break, that'd help immensely as well.