Mucky Fingers Childrens Spaceman Duvet Cover Bedding Set (Twin Bed) (Spaceman) Please note: This product is a UK import, the duvet cover supplied is slightly smaller than the standard US duvet size, it will fit but the duvet may fold at the edge when covered. This is not a comforter but a cover for a duvet. Spaceman design duvet set. Available in single and double sizes. Includes duvet cover and pillowcase.