Approximately 18 inches by 18 inches measured from the corner of the pillow.  100% Polyester Fabric pillow Sham with a pillow form. This pillow is made from new canvas-type material and can be used indoors or outdoors. This is a coated canvas with a heavy hand.  Mildew resistant, stain-resistant, fade-resistant, and Machine washable. Made in the USA! These are all handmade and may vary slightly in size.