The Marmot Arroyo 30-Degree Down Sleeping Bag uses high-quality 800 fill goose down to keep you warm and a ultralight DWR-coated shell to keep it dry. With this combination of materials, the Arroyo takes on chilly, wet spring and fall backpacking trips with ease. This Marmot bag also has ground-level seams to eliminate cold spots and a trapezoidal Nautilus foot box to keep your feet from getting cramped. At a weight of only 1lb 11oz, the Arroyo is easy to pack. Even though its light weight makes you less tired during the day, it still assures a comfortable sleep.