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 (114, 116) are strips of an at least partially flexible material interconnected to the front and rear sheets (118, 120) horizontally along a width of the panel and the top and bottom vanes (114, 116) are flexible, yet rigid, the top and bottom vanes (114, 116) 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 (114, 116) are strips of an at least partially flexible material interconnected to the front and rear sheets (118, 120) horizontally along a width of the panel and the top and bottom vanes (114, 116) are flexible, yet rigid, the top and bottom vanes (114, 116) 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 (114, 116) are strips of an at least partially flexible material interconnected to the front and rear sheets (118, 120) horizontally along a width of the panel and the top and bottom vanes (114, 116) are flexible, yet rigid, the top and bottom vanes (114, 116) 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.