The North Face Chrysalis Down 20F Sleeping Bag masterfully traps in warmth in cold autumn conditions. Its trapezoidal baffle construction, down-filled draft tube, and face tube maximize heat retention by eliminating escape through seams, zippers, or the head opening. The North Face cleverly built the Chrysalis with ground-level side seams, so rising heat has nowhere to escape. The North Face tests the European goose down at three stages of production for loft and moisture resistance to ensure you enjoy the highest possible quality of insulation. Sleeping pad retention loops secure your pad to the mummy bag, keeping you from rolling off mid-slumber.