Mountain Hardwear Women's ExtraLamina 20 Regular Sleeping Bag Polyester, Nylon Extra wide semi rectangular cut allows for freedom of movement Dual zippers extend around footbox allowing the bag to be opened up and used as comforter, two bags to be zipped together and increasing ventilation options Proprietary welded Lamina construction enhances loft and eliminates cold spots Thermal.Q insulation has outstanding compressibility and maintains excellent loft Dual draw cords at hood adjust hood and chest closure