Super Mario Childrens/Kids Retro Twin Comforter Cover Bedding Set (Twin) (Multicoloured) Please note: This product is a UK import, the sheets supplied are 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 sheets for a duvet. Twin bed set with Super Mario design. Quilt cover: 54in x 79in, Pillowcase: 19in x 30in (all approx). 100% Polyester.