Soft-Lite 6400 sliding patio doors provide a picture window view—yet are still specifically designed to give you excellent energy efficiency and unparalleled storm protection. They are rigorously tested and impact rated, so they'll provide outstanding performance—even in the toughest conditions. These super-strong doors are perfect for locations such as coastal areas, that require doors that help to keep out wind and water. 6400 patio doors are also designed to lower your home energy costs and greatly enhance the comfort level in your home.