The Mountain Hardwear ExtraLamina 20 is built to maximize internal volume, with it's semi rectangular shape. You have the option to unzip the bag entirely, for use as a quilt. It features compressible Thermal.Q insulation for light and lofty warmth. Mountain Hardwear Lamina welding holds insulation in place, without creating cold spots caused by traditional stitching. The result is bags that are warmer, lighter, loftier and more durable over the long haul. Extra wide, semi rectangular cut for freedom of movement. Versatile dual zippers extend around the footbox, allowing it to be opened up for use as a quilt, to zip to bags together or for increased ventilation. Proprietary welded Lamina construction enhances loft and eliminates cold spots. Thermal.Q insulation is soft, compressible and durable. Durable, lightweight 40D micro ripstop 100% nylon shell has DWR treatment to repel water. Soft, 40D polyester taffeta lining wicks away moisture. Dual draw cords at hood for adjustment. Nylon mesh storage sack and stuff sack included. Available in regular and long lengths, left and right zip.