The North Face Lynx 40 Degree Sleeping Bag is a new ultralight 40°F synthetic bag is an extremely compressible bag ideal for summer backpacking, or other weight-sensitive trips. The Lynx Sleeping Bag features Buttery soft fabrics, ClimashieldŽ Prism shingled construction with ClimashieldŽ Apex layered against the body, Glow-in-the-dark pull-loop on zipper, Inspired fit and function, Internal draft tube pockets keep essentials warm and within reach, and Light compression stuffsack.