With the zone insulation system featured in the Slumberjack Lapland 20 Degree Down Hybrid Mummy Sleeping Bag, you?ll keep the furnace evenly warm. There?s DriDown insulation on top with anti-compression Slumberloft-PRO ground layer to maintain warmth below you. DriDown uses a proprietary treatment to create a hydrophobic finish on each down plume, allowing the insulation to stay dry longer, loft better & dry faster than untreated down. Slumberjack?s unique ?arms-out? feature allows you to keep insulation on your chest and head while freeing up both arms to manage tasks without leaving your bag. Dual zippers provide unrivaled ventilation options and a relaxed mummy silhouette provides an excellent combination of comfort and thermal efficiency. Waterproofing at the head and foot box keeps the areas that touch the tent dry.Dri-Down? insulation: Down is treated with a molecular level polymer to create a hydrophobic finish on each individual down plume. This finish allows DriDown? to stay dry longer, loft better, and dry faster than untreated down, keeping you warmer in any environment. Hybrid Zone insulation combines Dri-Down & Slumberloft-Pro synthetic insulation. Dual 57" long zippers with two sliders each provide unequaled venting options. External hook & loop tabs combined with dual zippers create "arms out" functionality. "Double-Dri" waterproof panels on the hood & footbox provide additional water resistance. Black colored "Solar Liner" fabric allows fabric to dry more rapidly in the sun. Relaxed mummy shape enhances comfort and ease of use. Anti-snag zipper construction. Deep contoured jacket style hood with dual adjustment cords. 3" wide, full length draft tubes along both zippers prevent heat loss and keep cold air out. "No-Snag liner" allows for unrestricted freedom of movement when wearing wool or synthetic baselayers. Stuff sack & mesh storage sack included.