It's light. It's flexible. It withstands frigid temperatures on mountaintops. And in the entire history of humans staying warm, nobody's been able to beat it.
Down jackets come in different shapes and sizes. For more flexibility and something to wear when you're out on a cool day, there are narrower strips of down. Which means there's less bulk and it's easier to move about.
Now, for a big snowy day, think big! Bigger quilts, but fewer, so the jacket stays lightweight and comfortable. Each larger quilt gives the down more room to loft - more room to fluff out. Which results in more insulation, and transforms your stylish jacket into the perfect shield against the cold!