Bed-e-Byes Lining For Long Curtains-Thermal Blackout Specification.. Create the perfect sleeping environment during daylight hours with these thermally backed blackout curtains. Designed for easy attachment to your bed-e-byes tape top curtains. Features Size: 178cm x 183cm Thermal Backed to help retain the heat in your baby's nursery. These Blackout curtains are designed to be cut to size so can be used with a wide range of curtain sizes.