Comfort: 0 C (32 F) Limit: -6 C (20 F) Extreme: -23 C (-9 F) This is the field-proven, feature-packed down bag you've always wanted. The bag is loaded with the comfort features that Therm-a-Rest bags are known for. 650 Fill Nikwax Hydrophobic Down: Absorbs 90% less water and dries 3 times faster without using dangerous PFCs. W.A.R.M. Fit: With Additional Room for Multiple positions (W.A.R.M.) fit means this bag allows for various natural sleep positions while maintaining thermal efficiency. SynergyLinkConnectors: Integrate the bag with a pad for optimal comfort and thermal efficiency; removable for versatility. Zoned Insulation: Maximizes warmth and saves weight by intentionally placing down where you need it most. Box Baffled Construction: Uses mesh walls to maximize loft and minimize cold spots. Toe-asisFoot Warmer Pocket: Baffled pocket of insulation rapidly warms cold feet. Quilt and Blanket Loops: Customize your sleep system by layering our quilts or tech blankets for increas