Abstract: A door assembly for a shelter, wherein the shelter comprises a frame assembly and a cover for covering the frame assembly, wherein the door assembly includes a door frame; a door coupled to the door frame, wherein the door is preferably of a flexible material that can be lifted to provide an opening into the shelter and can be lowered for enclosing the shelter, wherein the door includes a plurality of pockets; a plurality of elongated door members, each of which includes a first and a second end, wherein each of the plurality of elongated door members is positioned within a respective one of the pockets; a plurality of first couplers, each of which couples the first end of a respective elongated door member to a first side of the door frame; a plurality of second couplers, each of which couples the second end of a respective elongated door member to a second side of the door frame; and a door lifting/lowering assembly for lifting the door to provide the opening into the shelter and for lowering the door for e