Catherine Lansfield is renowned for style and quality - designed and developed in Great Britain. A sprinkle of festive cheer with the glow-in-the-dark snowflakes and snowman can act as a night light to help them drift off. Made from 52% Polyester 48% Cotton. Machine Wash at 40 Degrees. King Duvet Set- 220x230 cm + 2x 50x75 cm Pillowcases. To see the glow-in-the-dark effect at its best, this product should be exposed to either day light or household lighting for at least 30 minutes before bedtime. The effect will initially become more obvious as your eyes adjust to the dark. There will still be some visibility of the glow effect for at least 30 minutes after you switch the lights off.