"This high-quality, lightweight bag is ideal for experienced adventurers on high-alpine climbs or cold-weather backpacking. It features 850-fill down insulation, a 10D recycled shell, mummy cut, four-chamber hood, contoured footbox, draft collar, and durable water-repellent finish. It is windproof and breathable, suitable for severe weather and intense climbing trips." - Travel + Leisure Editors