Let's talk fabric.
This fabric is top shelf. Specifically, it's an extremely fine stretch woven, with a whole lot of technology in the yarn and milling techniques. The lofted insulation, those little fuzzy "bowties", serve an important role in trapping heat, while the fabric does its job allowing moisture to escape, but not enter.
Each strand of fiber used in this fabric has a patented treatment that permanently resists moisture. This makes the jacket water-resistant and quick drying without a membrane or a coating that can wash off.