Ok is a down jacket built to warm, not broil. Premium German duck down provides startling warmth. A sophisticated hybrid design ensures proper ventilation. Ok was designed with the needs of mountain athletes in mind: in treacherous conditions, sweat is just as dangerous as the cold. Doing anything in winter’s worst is hard enough. Why make it harder? Clever construction gives Ok its superior comfort. Ample amounts of high-quality down fill Ok’s quilting. A DWR-coated synthetic blend face fabric resists the wet. In high-vapor areas, panels of Polartec’s Power Stretch Pro technology grant both agility and breathability. The result is a down jacket that moves as you move, aerating the whole time. A central double-zip extends ease of wear. Two side pockets and one internal chest pocket keep essentials at hand. All down inside 66°North products is ethically sourced from our long-time German supplier, who has been certified in accordance with the Responsible Down Standard (RDS) Downpass, and the STANDARD 100 by OEKO-TEX®. Here, 800-fill duck down is used to provide exceptional warmth for weight. Ok can be worn as an outer layer or a mid-layer, but is cut true-to-size as an athletic outer. Please refer to the size guide to find your precise fit. Those planning to wear it under a shell should order one size down.