The Big Agnes Blackburn UL 0 Degree Sleeping Bag is an ultralight sleeping bag for cold weather ski and hike tours. Warm down to 0°F, the 850 fill power down keeps it light and packable while the DownTek treatment repels water. Super helpful when Snow is around, melting or not. The rectangular shape tapers just enough to prevent cold spots while still allowing space for your feet and a full pad sleeve keeps you from rolling off all through the night. Features of the Big Agnes Blackburn UL 0 Degree Sleeping Bag Design improves connection between pad sleeve and bag providing a roomier sleeping space without adding bulk Sculpted contour allows the bag to drape around you, increasing Insulation Performance Free range hood design ? gives you the freedom to lift your head while snuggled in the hood Low profile cord lock lets you un-cinch the hood with one hand Tapered vaulted foot box creates wiggle room for your feet with out creating large cold air pockets Stretch fabric panel beneath hood creates a designated pillow pocket DownTek water repellent down repels water while maintaining insulating value Integrated full pad sleeve Rectangular shaped bag Superlight shell fabric with High tear strength Zipper garage Mate together left and right zip bags No-draft collar, No-draft wedge, No-draft zipper Interior fabric loops for sleeping bag liners Exterior loops for hang drying or storage Mesh storage sack and nylon stuff sack