902 fill Nikwax Hydrophobic Down: Stays dry and retains loft up to 60 times longer than untreated down. Absorbs 90% less water and dries 3 times faster without using dangerous PFCs. Unrivaled Packability: Lightweight materials and precise design allow for a smaller packed size than ever before. Box Baffled Construction: Uses mesh walls to maximize loft and minimize cold spots. SynergyLink Connectors: Integrate the bag with a mattress for optimal efficiency and comfort; removable for versatility. ThermaCapture Lining: Lined to trap radiant body heat and retain warmth without adding bulk or weight.