Designed with indivudal, non-connected panels that allow you to slide the doors to one end and stack neatly to create an unobstructed opening, the vistaline is unlike any other door system on the market. The Swiss designed system feature innovative retractable weather seals in the top and base of the track to provide advanced weather performance. When the doors are closed the handle operation expands the side jamb, compressing the doors together to form a highly effective weather seal between the panels.