The Nike ACG Lava Flow Therma-FIT ADV jacket pairs a 90% goose down and 10% feather fill with a lightweight nylon shell, delivering real warmth without real bulk. Therma-FIT ADV technology works alongside the down to regulate body heat as temperatures drop, while the packable build folds down small enough to disappear into a daypack. A hooded design and zipped pockets round out a jacket built to move between a mountain trail and a city sidewalk without missing a beat. What Our Gearhead(R) Experts Are Saying:"I stuffed this into the side pocket of my pack on a trip where I wasn't sure I'd even need it, then pulled it out for a cold night market and stayed warm the entire walk back. That's the kind of jacket you stop thinking twice about packing."