This Long bag adapts to the temperature range with ease. With three configurations to maximize your comfort range, this bag acts like three bags in one. For warm nights unzip the top two layers and use the bag like a 50 degree bag. On those semi-cold nights zip the mid layer on top and you have a 30 degree bag, and for the cold nights, zip the top layer and enjoy a 15 degree bag. Made with 30% post-consumer recycled polyester fibers, this is your new take anywhere bag.