1. Keep Draft Out: winter window curtain is designed to keep heat in your room and make a huge difference in the temperature. With the feature of windproof, waterproof, sound reduce, blackout, and keep privacy, the blanket blocks the cold air from coming into the room in winter, also keep warm air out in summer. 2. Heavy Duty Material: Our quilted thermal insulated material is very thick and heavy, high density waterproof coat Oxford cloth, the liner is double-layered and thickened with new silk, fluffy and soft, strong against the cold. Make a difference by heating that side of the house this winter. 3. Measure your Window: The actual curtain size: 38" W x 62" H. Warm reminder, please measure the width and height of the window before purchase, that fits up to 3' x 5' windows. 4. Unique Roll-up Design: Thermal curtain have 2 sticky strips on top so that you can roll up the curtain to see outside view, When rolled down and looped attachments connect, giving a nice tight seal around the window so that the house isn't losing heat.