Cold weather demands the ultimate in thermal efficiency, and the old-school analog solution is still the best: high fill-count goose down. Enter the Flylow Kenzie Jacket, a sleek puffy design that traps every available therm your body radiates and harnesses it for your comfort. With a Pertex Quantum 100% Polyamide shell and 800-fill Goose Down, the Kenzie is as close to the fireplace as you’re going to get when your outside in the elements.