For an ordinary pillow to become a quality outdoor throw pillow it needs to meet a few requirements. First off, it needs to be durable. It has to be able to withstand endless hours of sunshine and damaging UV rays without fading. It needs to be able to endure a rainstorm without rotting and growing mildew. The fabric should be machine washable because, lets face it, accidents happen. Things such as bleach and pool chlorine should not discolor the fabric. Secondly, because it’s a pillow it needs to be comfortable. No one’s first choice for a mid-day nap is to lay his or her head on a cozy brick. Lastly, it needs to be presentable. An outdoor throw pillow should compliment your outdoor furniture. Some like to coordinate the colors with their furniture or other decor in their backyard. Others like to get new pillows every year with a different fabric style to spruce up their outdoor areas. If a pillow can meet all of those requirements then it is suitable to be left outside.