The Big Agnes Torchlight collection consists of unique, expandable sleeping bags, and the Women's Torchlight UL 20 Sleeping Bag is a lighter version of the warmest Torchlight. Dual zippers allow you to expand the bag by about five inches to accommodate different clothes for different conditions. Slide the zippers down for extra room when you're wearing insulators, or if you simply want more room, and slide them back up to keep you snug in summer clothing. Big Agnes made this bag lighter, packable, and more protective for alpine environments. Its 850-fill down insulation is the lightest, most compressible down that Big Agnes uses, and Big Agnes treated the down to retain its lofty warmth in wetter environments.