ThunderCats Boys Bedding Duvet Cover and Pillowcase (Twin Bed) 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. High quality girls bedding set. 1 x Duvet Cover and 1 x Pillowcase. Fiber: 50% Polyester and 50% Cotton.