Throw pillows typically feature a removable cover with a feather pillow form stuffed inside and come in various sizes and shapes. The most common size throw pillow is 16 to 18 inch square. However, rectangular, circular and cylindrical throw pillows, called bolsters, are also popular. Outside the United States, throw pillows are more commonly referred to as cushions. Company logos and photos are placed on pillows as well to give a personalized look. This also give more professional look to them.