Western Mountaineering - Goose Down Sleeping Back - Left Zipper Size indicated: 5' 6" Non-original stuff sack included. The Western Mountaineering sleeping bag features high-loft premium goose down insulation (minimum 90%) designed for superior thermal efficiency. The shell is constructed from lightweight, high-tenacity ripstop nylon, engineered for durability while minimizing overall pack weight. The mummy-style cut is ergonomically shaped to maximize heat retention, incorporating a contoured hood and an insulated draft tube behind the zipper to prevent cold spots.