The beefy Dark Star -20°F synthetic bag from The North Face offers superior warmth in frigid, subzero conditions and high-altitude climbing expeditions FILL. Polyester. WEIGHT. Long - Right Zip: 5 lbs. 9 oz Regular - Right Zip: 5 lbs. 3 oz TEMPERATURE RATING (F). -20 degrees (F)

• Pertex® 20-denier nylon ripstop shell is lightweight and durable, and offers silky softness that enhances the insulation's loft
• Pertex shell features a Durable Water Repellent finish that causes water to bead up and roll off
• Climashield® a continuous filament insulation, provides warmth, durability and water resistance in a lightweight package
• Overlapping shingle construction distributes insulation evenly and keeps it from moving around so there are no cold spots
• Vaulted footbox allows natural foot movement and eliminates excess lateral space, increasing thermal efficiency to keep your feet warm and comfortable
• The North Face Dark Star includes a compression stuff sack that doubles as a summit daypack