No UL on trips in really cold weather-the below 0F stuff. You can UL in relatively warmer weather. The Canadians consider it UL if they aren't bringing a stove and big cotton hot tent. UL is all relative.

Tips from Wintertrekking.com:

Get some liner gloves for doing those chores or a pair of leather gloves for cooking. Don't risk melting a synthetic to your hands.

Make sure you have warm enough boots. You can hike out with cold hands, but maybe not with frozen feet.

Layering is the key in really cold weather; you need to keep dry as much as keep warm. Sweat is your enemy as much as anything else.