Ikea Ottil Cushion Cover 20 X 20" Black with Zipper. Jacquard Weave Gives the Cushion Cover a Pattern with a Subtle, Slightly Raised Relief Fits inner cushion 19 5/8 x 19 5/8". Product dimensions: Length: 20" Width: 20" Product description: 62% cotton, 38% polyester Care instructions: Cushion cover; Machine wash, warm 104 F(40C). Do not bleach. Tumble dry, low temperature. Do not iron. Do not dryclean. Shrinkage 4%. The zipper makes the cover easy to remove.