Material: Most are crafted from durable cotton linen, soft velvet, or a breathable polyester/cotton blend.
Design: Many feature a hidden zipper for a clean look. Some options are double-sided, while others have a solid cream or white back.
Sizes: The most common size is 18 x 18 inches (45 x 45 cm), but 16 x 16 and 20 x 20 inch sizes are also widely available.