"The Lynx is our series of underquilt designed for our Ridgerunner hammock, (It does NOT fit the Blackbird, the “Yeti” is designed to fit the Blackbird, the “Lynx” is designed for the Ridgerunner) it’s available in 3-season or winter weights, and is available in a torso-length or a full-length model. (see Yeti underquilt description for benefits of torso-length underquilts). 
 
The Lynx features a dual differential cut DWR 20 Denier ripstop nylon shell(Durable Water Repellency) and is filled with 850 Fill Power Hyper-Dry goose down that meets the new RSD certification (Responsible Down Certification)."
 
The above wording is straight from Brandon, and his team at Warbonnet Outdoors.
 
Lynx Underquilt Full Length Underquilt:
 
Fill Type: 850, Temperature: 20˚F (-6˚C), Quilt Fabric: Dark Foliage Green | 15D Ripstop Nylon, add-ons: Add Stuff Sack (Included)
 
 View the full product details on the Warbonnet Outdoor website.