The black-lined curtains provide shade and create a completely dark environment for times when you need to rest or protect your privacy during the day, such as bedrooms, home theaters, etc. Of course, the blackout curtains also help protect your furniture, reducing fading and damage caused by sun exposure. THERMAL INSULATION 2-7 DEGREES: These curtains can absorb and reflect over 90% of the sun's energy. In summer, heat and ultraviolet energy cannot enter the room, which lowers the indoor temperature by 2 to 7 degrees. In winter, most of the heat radiating from the human body and indoor objects is reflected by the curtain, effectively preventing heat loss and increasing the indoor temperature by 2 to 7 degrees. 2-LAYER WEAVING TECHNOLOGY: The blackout curtains are sewn onto the black polyester inner lining with an innovative two-layer weaving technology, which replaces chemical coatings. The seams on the inner lining are finely processed. 2 PIECES: Each curtain measures 132 cm (width) x 160 cm (height) and comes in two pieces. It is recommended to choose the correct size after measuring your windows.