This Inferno Sleeping Bag is The North Face's warmest expedition bag and is designed for the world's harshest environments. The North Face treated this bag's light and lofty 800-fill down insulation with ProDown water-resistance to retain its warmth in wet weather. Neovent Air fabric adds extra water-resistance to the hood, back, and footbox for moisture-riddled tents. A generous mummy cut helps you layer up before you go to bed, and the half-length center zipper offers easy entry. The North Face also added a cinch-cord at the hood and draft tubes at the collar and overlap to keep frigid winds at bay. This bag also features an internal pocket to insulate electronics and valuables.