It's July 4th, you're heading to Stanley, Idaho for some fun in the Sawtooths, and the weather forecast calls for a chance of snow. Or maybe it's the end of fall and you're getting one last backpacking weekend trip in before winter hits. Cram The North Face Furnace 20 Degree Down Sleeping Bag in your pack so you don't waste the mornings defrosting in front of a fire. This bag's shape gives you room to move during the night so you won't feel like you're wearing a straightjacket to sleep. The Furnace 20 is stuffed with 550 fill ProDown to maximize your slumbering comfort over a range of temperatures the down is comfort rated at 34F with a lower limit of 23F. Ordinary down offers the best warmth to weight ratio but will fall prey moisture, be it snow or sweat from a night terror involving camping pranks your backpacking buddies are creative. ProDown dries faster than plain old down and repels moisture up to 10 times longer. Now, when various prank scenarios invade your dreams, your bag won't stay soggy throughout your trip. At your head, shoulders, hips, and toes, Heatseeker Eco synthetic insulation acts as an anti compression pad to create a thermal barrier between you and the ground. Cold won't creep in as quickly and heat won't slip out so suddenly. The comfort oriented mummy shape leaves room for you toss and turn. The vaulted footbox lets your toes wiggle without restraint, while the shaped hood and draft collar cuddle your clavicles. For shoulder season and high altitude summer warmth, turn to the Furnace 20.