The Greystone 20 is a lightweight mummy sleeping bag designed for backpacking and multi-night trips. It is rated to 20°F and features 650-fill DownTek insulation for reliable wet-weather performance. The shell and lining are water-repellent, recycled, and treated without PFAS. It includes a contoured hood, draft collar, and no-draft zipper to enhance thermal retention. Baffle construction reduces cold spots and retains loft. The zipper mate system allows connection with compatible bags for shared warmth.