What Our Gearhead(R) Experts Are Saying:"This sleeping bag is a must-have for extreme alpine conditions. The ProDown insulation is incredibly warm and stays lofted even in damp environments, while the shockcord system keeps my sleeping pad secure for a comfortable night. It's a great choice for serious expeditions."Designed for high-altitude adventures and extreme cold, the Inferno Sleeping Bag delivers the ultimate in warmth-to-weight performance. Crafted with recycled nylon and aluminized XReflex technology, this bag maximizes thermal retention without adding bulk. The 800-fill ProDown insulation, certified to the Responsible Down Standard, provides superior loft and warmth even in damp conditions. This sleeping bag features a fitted hood, vaulted foot box, and full draft collar to seal out cold air. Trapezoidal baffles eliminate cold spots, while NeoVent Air fabric at the head and foot box provides breathable, waterproof protection.