Reddit reviews Linen Avenue U6SH3950B48 Custom Cordless 39 1/2 W x 42 to 48 H Seashell Blackout Cellular Shade

Linen Avenue blackout shades allow no light to pass through the fabric (they are foil lined)For inside mount measure your window horizontally in three places; top, middle and bottom, use smallest measurement and subtract 1/4in from the width of your window measurement, and order this widthFor outside mount add 4 inches to the width of your window measurement, and order this width . This will allow for a 2 inch overlap on each side of the windowEach 9/16 inch single cell honeycomb cordless cellular shade is child and pet safe with a smooth cordless operation that conforms with CPSC child safety guidelinesEnd caps, simple snap-in brackets (that fit for both inside mount and outside mount applications), and mounting hardware is included