Best Cold Weather Base Layer Top

I purchased the Furnace bottoms in Dec of 2021 and I was so impressed that I had to purchase this top as well. I've worn it on several cold weather (25 degree), 6+ hour sits in a tree stand to late season duck hunting in AK and this top is outstanding. The best thing about it is that it is warm enough to keep you comfortable without having to add several other layers under or over.