When you're meticulously packing for your hike to the top of Lone Peak to get a weekend of climbing in, pack your Therm-a-rest Parsec 20 Degree Down Sleeping Back for the trek and stay. With the Parsec's slim design and ultralight weight, this is the perfect sleeping back to pack when you already have to haul a rack, water, food, and your other climbing gear up the 12-mile trail. Constructed with ripstop polyester and hydrophobic down, this sleeping bag will keep you warm on chillier fall nights and early spring evenings and dries quickly in case you spill a beer or collect dew on the Parsec over the night. The large footbox has an extra pocket of down to keep your toes extra warm on cold nights under the stars so by the time morning comes, you'll be well rested and toasty, ready to get on the granite walls.