Therm-a-Rest Dorado Duo 35-Degree Down Sleeping Bag and Quilt Versatile: use as a bag or unzip completely flat for use as a two-person quilt Mateable: mates with another dorado HD using outside zippers for easy entrance/exit when set up in the two-person configuration Reliable insulation: lightweight, 650 fill nikwax hydrophobic down packs small and stays Dry longer Removable synergy link straps: connect with your mattress to keep you on it all night, or remove them when mating with another bag Lowest recommended temperature: 45F - 35F (7C - 2C)