Comfortable, versatile and sustainable. One side of the bag is filled to 3season warmth specs and the other is filled to 1 season specs for variable warmth depending on the conditions. Fulllength wrap around zipper with top snap drawcord for venting allows unzipping for use as a comforter or for pairing with second bag 3D footbox maximizes efficiency and comfort Zipper with reversible slider backed by snagresistant guard on lining Internal and external hang loop