Fit & Design: Water-repellent, certified 650-fill-power duck down insulation with Down Defender is protected by a durable nylon shell that has a water-repellent finish to shed condensation Down is certified to the Responsible Down Standard (RDS) by Control Union Anatomic wraparound footbox increases insulation and room for your feet to enhance warmth and comfort Nautilus multi-baffle hood envelops your head in warmth; down-filled collar with easy-access drawcord also adds warmth Draft tube backing the full-length, snag-free YKK 2-way zipper prevents cold air from seeping through Fold-down second zipper provides added ventilation and easy access Internal stash pocket; heater pocket in footbox lets you add a heat packet for cozy warmth; heater packets sold separately Technology: Shell: 20-denier mini ripstop nylon Water-Resistant Down: Yes Fill: 650-fill-power duck down Lining: 20-denier nylon plain weave Additional Details: Includes stuff sack and large storage bag