Universal Textiles Little Monster Childrens/Kids Duvet Cover Bedding Set (Twin) (Multicolored) Please note: This product is a UK import, this 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. Single/twin duvet cover bedding set with cute Little Monster design. Duvet size: 47in x 59in. Pillowcase: 16in x 24in.