Made specifically with the ladies in mind, the Mountain Hardwear Women's Lamina 0 Degree Synthetic Sleeping Bag says its zero degrees, and it means it. The Thermal. Q polyester fill is highly compressible, maintains its loft, and performs far better than down in wet conditions, which makes this bag an obvious choice for backpacking in cold and wet climates. Lamina construction attaches the shell directly to the insulation, eliminating cold spots caused by typical baffle construction, while the standard mummy cut provides utmost efficiency. With a zero-degree rating, this Lamina makes a great option for those looking to snag one bag and one bag alone, since it works for mild winters, but can unzip for regulated cooling if you're using it year-round.