What is the maximum window size I can use the blackout curtain on?

Aycorn's blackout curtain is intended for use on clean, dry windows that measure up to 130 x 200cm. Simply fold and resize the curtain to your desired size using the velcro fasteners. To permanently attach the curtain to the window frame, glue the additional velcro tape to the wall or window frame and attach the blackout curtain to it.