Description The Big Agnes Sidewinder 0 Degree Sleeping Bag is built specifically for side sleepers who need warmth and comfort during cold-weather backpacking trips. Featuring Second Generation Side Sleeper Technology, its body-mapped design moves naturally with you as you shift positions throughout the night, eliminating the restrictive feel of traditional mummy bags. Insulated with 650-fill DownTek(TM) water-repellent down, it delivers excellent warmth and packability, while strategically placed FireLine(TM) ECO synthetic insulation at the hips, knees, and shoulders enhances comfort at key pressure points. Designed for performance in freezing conditions, the Sidewinder includes a jacket-style hood that moves with your body, a thermally efficient footbox shaped for side sleeping, and thoughtful features like a Pillow Barn sleeve and draft-blocking zipper construction. Built with durable recycled materials and rated to 0AdegF, this sleeping bag offers dependable warmth, mobility, and comfort for serious backcountry adventures. Specs Total Weight 3 lb 4 oz ISO Comfort 18AdegF ISO Limit 5AdegF Fill Type 650 DownTek(TM) + FireLine(TM) ECO Total Fill Weight 27 oz Down + 6 oz Synthetic Compressed Bag Size 9.5" x 10" Stuff Sack Size 26 L 10" x 21" Max User Height 5&'; 6" Recommended Pad Size Works with any pad size or style Shoulder Girth 58" Hip Girth 52" Foot Girth 33" Manufacturer Warranty Limited Warranty