Sierra Designs took a new approach to designing the Backcountry Bed 600 Sleeping Bag so you can sleep comfortably at the car camping site. Free from extraneous hardware like bulky zippers and drawcords, this intuitive bag features an oval shaped opening with an integrated comforter that helps the bag adapt to variable temperatures. You can tuck the comforter's sides snugly beneath you and stay warm in temps as low as 15F, or you can pull the comforter out to stay comfortable during the warmer parts of the year. Its unique mummy design allows you to sleep on your stomach or sides as well as your back, which is excellent because most mummy bags only let you sleep comfortably on your back. Sierra Designs stuffed this bag with 600 fill duck down insulation that was treated with DriDown, which means the down won't just absorb water and get cold and clumpy if it happens to get wet. Sierra Designs built the Backcountry Bed's shell out of ripstop for durability and the liner out of taffeta for your comfort. This bag also features insulated pockets for your arms so you never wake up in the middle of the night because your hand slipped out of the bag and is slowly chilling. There's also an integrated sleeve for your sleeping pad so you never roll off of it during the night and wake up on the rocky ground. This bag is warm enough for the cold nights, versatile enough for the warm nights, and comfortable enough to keep you nice and cozy on car camping trips.