Are these true blackout curtains?

No. The fabric blocks about 75% of incoming daylight, so they dim a room and cut glare but let some light through. For near-total darkness, look for panels rated 99% or higher.

What size window do two 40-inch panels cover?

Each panel is 40 inches wide and 84 inches long. Two panels give 80 inches of flat width, which suits a window around 40 to 55 inches wide once the pleats gather the fabric.

How do I hang triple pinch pleat curtains?

They need curtain hooks threaded into the pleat header and a rod with rings or a track. The pleats are fixed, so the panels hang in even, tailored folds rather than sliding flat.

Will they darken a bedroom enough for sleep?

They soften morning glare and help in rooms where some light is fine. Light sleepers or people who need daytime darkness should pair them with a blackout liner or choose full blackout panels.

How should I care for the pleated polyester?

Spot clean or vacuum gently, and steam out packing creases rather than ironing the pleats flat. Check the care label before machine washing, since the pleat header can lose its shape.