COMFORTABLEDraft Collar: To maintain thermal comfort throughout the night, an insulated tube wraps around your shoulders to prevent heat from escaping as you sleep.Stash Pocket: A small pocket is integrated into the draft collar – perfect for stashing a headlamp, wallet, phone or midnight snacks.Soft Fabric: The soft, hydrophobic, 20D nylon lining is silk-sheet comfortable and won’t absorb moisture. Temp Rating: Tested and rated at 20˚ F for three season comfort. Fill: Warm, lofty 650 fill-power white duck down is lofty, warm and breathable.Half-Moon Foot Box: The three-dimensional foot box utilizes a half-moon shape to help retain warmth, provide added room for greater comfort, and to allow the use of one of our sleeping pads inside the bag.Flex Baffles: Flexible baffles provide freedom of movement and keep the insulation close to your body for more efficient thermal performance and exceptional comfort. Expanded Chest Area: Thoughtful patterning expands the girth at the chest for added comfort and the freedom to move throughout the night without impacting thermal performance.Mummy Hood: Insulated and comfortable, the mummy wraps the head to maintain essential warmth.RUGGEDWater Resistant: Outer fabric has a durable water repellent (DWR) treatment to protect the insulation from moisture that can impede thermal performance and add weight.Durable Fabric: Light and tough 20D rip-stop nylon has a high strength-to-weight ratio to help resist tears without adding unnecessary ounces.¾” Full-Length Zipper with Guard: Burly, but not bulky, the 3/4“ full length zipper has two-way sliders so it can be unzipped from top or bottom for ventilation. A full length zipper guard helps seal out drafts.Pack Size: Two stuff sacks included for compact transport and larger storage.LIGHTWEIGHTLightweight Materials: The 20D rip-stop nylon is light and compressible.650 fill power white duck down fill provides exceptional warmth for its weight.