The North Face Furnace 35 Degree Down Sleeping Bag offers toasty warmth for cool summer nights, water resistant protection for variable weather and high humidity environments, and roomy comfort when sleeping space is more important to you than a few ounces of weight savings. The Furnace's 550 fill goose down is water resistant for reliable performance when conditions aren't perfectly dry, and the water repellent outer fabric and lining protect both you and the bag from heat robbing moisture. Strategically placed synthetic insulation pads underneath you made of 30% recycled material add an extra layer of protection between you and the cold ground, and a draft collar helps keep your body warmth in and the cool night air out. The insulation is evenly distributed from top to bottom so you don't get uncomfortable cold spots when you're moving around in the sleeping bag. The Furnace's relaxed mummy shape allows the bag to stay more thermally efficient than a rectangular sleeping bag while offering more room to move than ultralight mummy bags with more aggressive tapering. The fitted hood with a drawcord keeps the area around your head warm, and a vaulted foot box offers roomy vertical space for your feet. The bag is outfitted with a convenient, non snagging two way zipper nice if you prefer some fresh air around your feet on warmer nights, and the zipper pull glows in the dark to make unzipping in the middle of the night or before dawn less of a hassle. The highly compressible Furnace packs down into a 8x13 inch size for fitting inside your backpack, and its down insulation lofts back up when you take it out for optimal warmth, again and again.