A covering for an architectural opening, the covering comprising: a roller ; an end rail ; and a panel rotatable onto the roller and spanning between the roller and the end rail , the panel including a front sheet ; a rear sheet operably coupled to the front sheet ; and a cell spanning between the front sheet and the rear sheet; wherein when the front sheet is at a first position relative to the rear sheet , the cell is open and when the front sheet is at a second position relative to the rear sheet , the cell is closed; wherein the cell is defined by a top vane and a bottom vane interconnected together; wherein, when the cell is open, the top vane is spaced apart from the bottom vane to define a cavity, wherein, when the cell is closed, the top vane is positioned substantially adjacent to the bottom vane ; and wherein the top and bottom vanes are strips of an at least partially flexible material interconnected to the front and rear sheets horizontally along a width of the panel and the top and bottom vanes are flexible, yet rigid, the top and bottom vanes being flexible enough so that they may be compressed to a substantially flat position without being damaged, yet be rigid enough so that they may maintain their shape when the cell is open. a roller ; an end rail ; and a panel rotatable onto the roller and spanning between the roller and the end rail , the panel including a front sheet ; a rear sheet operably coupled to the front sheet ; and a cell spanning between the front sheet and the rear sheet; wherein when the front sheet is at a first position relative to the rear sheet , the cell is open and when the front sheet is at a second position relative to the rear sheet , the cell is closed; wherein the cell is defined by a top vane and a bottom vane interconnected together; wherein, when the cell is open, the top vane is spaced apart from the bottom vane to define a cavity, wherein, when the cell is closed, the top vane is positioned substantially adjacent to the bottom vane ; and wherein the top and bottom vanes are strips of an at least partially flexible material interconnected to the front and rear sheets horizontally along a width of the panel and the top and bottom vanes are flexible, yet rigid, the top and bottom vanes being flexible enough so that they may be compressed to a substantially flat position without being damaged, yet be rigid enough so that they may maintain their shape when the cell is open. a front sheet ; a rear sheet operably coupled to the front sheet ; and a cell spanning between the front sheet and the rear sheet; wherein when the front sheet is at a first position relative to the rear sheet , the cell is open and when the front sheet is at a second position relative to the rear sheet , the cell is closed; wherein the cell is defined by a top vane and a bottom vane interconnected together; wherein, when the cell is open, the top vane is spaced apart from the bottom vane to define a cavity, wherein, when the cell is closed, the top vane is positioned substantially adjacent to the bottom vane ; and wherein the top and bottom vanes are strips of an at least partially flexible material interconnected to the front and rear sheets horizontally along a width of the panel and the top and bottom vanes are flexible, yet rigid, the top and bottom vanes being flexible enough so that they may be compressed to a substantially flat position without being damaged, yet be rigid enough so that they may maintain their shape when the cell is open. <EOS>