On a gusty winter day, the Sullivan-Z Down Jacket leans on its windproof shell, which also sheds light moisture. Traceable 800+ fill duck down sits beneath it for insulation. A removable bib with hood adds coverage when the cold deepens and comes off when it eases. What Our Gearhead(R) Experts Are Saying:"On a brisk morning walk across town, I keep a fast pace and stay comfortable because the breathable shell lets built-up heat escape. When the wind picks up along the way, the windproof layer holds the cold off."