The Mountain Hardwear Specter 15F Sleeping Bag is designed for serious go-getters. It can keep us warm and dry while we lounge in a portaledge high above the ground below or backpack to high-alpine lakes in cool fall weather. The Pertex Quantum Pro Diamond Fuse shell material offers weather-proof protection while increasing the durability of the sleeping bag, so we can bivvy beneath the stars if we need to. The 800-fill down insulation is incredibly warm and easily packable, which is especially valuable when space is at a premium on multi-day trips. Dual-sided zippers allow both of our arms to be free to perform tasks in our tent while keeping our bodies fully insulated and they can be used to circulate air in milder conditions.