The Snugpak Hammock Under Blanket keeps you warm and protected from the wind and cold that penetrate the bottom of your hammock as you lie suspended during the night. It fits snugly to the outside of most hammocks and uses high-loft fibers as insulation to trap your natural body heat, sheild you from draft, and increase overall comfort. Micro Diamond fabric casing repels water, while Paratex antibacterial treatment reduces bacteria and odor. Plus, the under blanket packs down to just 9 inches square.