The Versalite Sleeping Bag is designed for alpinism and backpacking at 10-degree temperatures. It features 850-fill down insulation for lightness, loft, compressibility, and packability. The ExtremeLite shell offers durability with a high thread count. Interlocking draft tubes and a down-filled collar minimize heat loss. It has a mummy shape with wider shoulders to accommodate layering in cold climates.