For a winter bag you want 850+ fill power down and about 650 grams of it for a minus 9-10 c bag.
Look for a good brand with these specs. You can decide what sort of outer material you want. Heavier or lighter fabric.
In your sleeping pad look for a R value of 6 or more for winter camping. The Nemo Tensor gets good raps and not too heavy. I use a down mat 9, good pad larger and heavier but fair trade off for winter.
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