It will also keep cool air from escaping during the summer months. [substeps] Most thermal liners are made from cotton, polyester, or a blend.
[header] How to line curtains [title] Select a thermal liner if you'd like to insulate your windows. [step] If your windows are drafty or thin, save on your heating and cooling costs by lining the curtains with a thermal fabric. The insulation will keep heat in your room during the winter while keeping out drafts from the window.