CafePress St. Patrick's Day Celtic Knot Decor Throw Pillow (18"x18") Add stylish fun to any room with our roomy Throw Pillow. Measures a sprawling 18" X 18" with an 11" X 11" image area so you can lounge in comfort. Made of ultra-soft brushed twill with a sturdy canvas image area. Cover + Insert option ships with pillow insert. Cover only option does not. Removable zippered cover for easy laundering.