Weathermate Tab Top Curtains Help block out the sun, heat, or cold and save energy with the cotton duck Weathermate Tab-Top Insulated Curtains. Using Thermalogic(TM) technology, these insulated curtains have energy-efficient thermal shade backing made of 100% acrylic suede. window treatment has 3.5" tabs. Washable. Imported. Weathermate Tab-Top Insulated Curtains come in many different colors to coordinate with your decor. window treatment also has wide width curtains available.