Spongebob Squarepants Childrens/Kids Happy Reversible Duvet Cover Bedding Set (Twin Bed) (Multicoloured). 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. Single bed set with reversible Spongebob Squarepants design. Duvet cover: 53in x 79in, Pillowcase: 19in x 30in (all approx). 100% Polyester. Machine washable. .