Sleep in the wild like you do at home under a comforter, with the Sierra Designs Backcountry Bed Duo 600 Sleeping Bag. This cozy bag for two features a zipperless design. Enter the bag through the large opening at the top. The oversized integrated comforter seals the opening so you can sleep comfortable and naturally on your back, side or stomach. The oval opening intuitively adjusts in width to prevent cold drafts, yet wont restrict your natural sleeping position. 600 fill DriDown insulation stays dry 10 times longer than untreated down and dries 30% faster. Zipperless design means no hardware, cords or Velcro to get in the way of your comfort. Catenary shaped opening is smaller than the bag width, so when you push out, the walls push in to seal out drafts. Versatile integrated comforter wraps naturally to your preferred sleeping position and allows for easy adjustment to varying temperatures. Insulated handarm pockets provide insulation under your arms when comforter is used outside the bag. Hands free foot vent self seals, and can be operated from the inside of the bag using only your feet to easily adjust to varying temperatures. Sleeping pad sleeve secures your sleeping pad to the bag. Backcountry Duo has two sleeves, each adjustable to fit 20 25 inch wide pads.