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The North Face Furnace 20/-7 Sleeping Bag is a down sleeping bag for staying warm inside your tent. The 20 degree bag is filled with 550-fill ProDown, allowing it to compress down small so it won’t take up as much space in your backpack. ProDown is just like regular down, but has a finish on it that repels water, allowing the down to work better in wet conditions. In addition, the bottom half of the bag has a layer of synthetic insulation (Heatseeker Eco), which is less susceptible to compression and provides additional thermal heat. A less tapered mummy shape allows you to toss around inside so you can get comfortable faster instead of having to count sheep.