The Women's Sierra Designs Night Cap 20 Degree Synthetic Sleeping Bag is a zipperless sleeping bag for comfy snoozing through the night. The synthetic insulation offers warmth down to 20-degree nights, and the blanket-like wrap provides a cozy at-home feel. The integrated sleeve on the bottom holds your sleeping pad in place so you won't slide off in the night, and a self-sealing foot vent allows for temperature regulation through the night.