Splitting the difference between comfort and performance, the Nemo Verve sleeping bag features a unique spoon shape that is wider at the shoulders and knees, allowing you to sleep comfortably in various positions.. . . . . . . 20Adeg rating makes this bag perfect for three season use. Spoon shape gives you additional room around your shoulders and knees allows for sleeping in multiple positions. Insulated blanket fold mimics the turned down edge of a comforter wrap it around your neck and face to block drafts or turn it down during warmer nights. Stratofiber synthetic insulation is designed to mimic the properties of down. 40D nylon construction with DWR durable water repellent finish. Includes cotton storage sack and drawstring stuff sack .