Teenage Mutant Ninja Turtles Childrens Boys Urban Reversible Single Duvet Cover (Twin) (Blue) Teenage Mutant Ninja Turtles duvet/comforter set to fit single/twin bed. Reversible design. Size: Comforter cover 54in x 79in. Pillowcase Size 19in x 30in (all sizes approx). 50% Polyester, 50% cotton.