Childrens/Kids Moshi Monsters Quilt/Duvet Cover Bedding Set (Twin Bed) (Blue/Green) Childrens/Kids Moshi Monsters Design Duvet Set, perfect for your childs bed. Size - Duvet cover: 53 x 79 inches. Pillowcase: 19 x 29 inches (all sizes are approximate). Made from 52% Polyester and 48% Cotton. Machine washable.