Note: Each custom size top/up down cordless window blind is made to order, can't be sold after a return. We appreciate customer precise measures & careful orders, avoid return without quality issues. Please contact us by Amazon message if you have any questions. Room Darkening Shade: the cordless heat blocking top/up down window shades is made of 0.78" single cell blackout honeycomb fabrics with aluminum foil, which can 100% block sunlight. All blinds for windows have a white backing to reflect even more daylight and provides a uniform appearance from the outside. The cordless blinds providing a child-safe and pet-safe environment. The cellular shades blackout offer complete privacy and light blockage, perfect for media rooms, nurseries, and bedrooms. Energy Saving: unique honeycomb construction offers soundproof, while also reducing the harmful effects of ultraviolet rays and providing ideal insulation for energy efficiency. These Blackout cellular shades provide insulation by trapping air between the honeycomb-shaped cells, keeping your home cool in the summer heat, and keeping the warmth secure inside during the winter. Smooth & Quiet Glide: Keego robust constant force spring-loaded mechanism has passed 5,000 times usual lifting or pulling down tests for each cellular blind and makes it easy to raise and lower the cellular shades evenly every time and stay balanced automatically; it retracts and extends smoothly with constant force; our patented spring winder inside prolongs the lifespan of the springs, avoids the rebound or sagging performance and simplifies the mount of the top down bottom up blinds Made to Order: the cordless blackout top down bottom up window blinds is custom made, custom width is 16" to 78", and height is 10" to 78". Inside mount requires 1.5" minimum window depth, we suggest deduct 0.25" for install security gap. For outside mount, the width you purchase is exactly the width you get. For more blackout, we suggest adding 4" to the width and height. Mounting hardware & Install instruction included, very easy to install.