This is the field-proven, feature-packed down bag you've always wanted. We've loaded this bag 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.
• SynergyLink^™ Connectors: Removeable ultralight straps create a secure bag-to-sleeping pad connection that optimizes the comfort and thermal efficiency of your entire sleep system. SynergyLink Connectors function best with regular sized sleeping pads that are 3 inches thick or less when inflated.
• 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.