When your warmest cold weather gear isnt enough, count on our Feather Pack Vest to help you reach new heights. Newly designed with a distinct silhouette, streamlined style, and updated baffling, this vest delivers superior weather protection in a packable form. Simply stated: this is the best down vest available in its class. Click Here To Learn More. . . 800 fill power goose down is one of the warmest insulations available. DownTekTM treated down absorbs 30% less water and dries 60% faster than untreated down. DWR Durable Water Repellent coating on nylon shell sheds light precipitation.