Outdoor cushions are usually made of cotton or polyester, so they can last longer, as they will stay outside and be subjected to various types of weather. Therefore, that is material to consider as you need something to last as long as possible. You do not want to change the pillows monthly, do you? That is why, like in any other decisions you make in your life, be sure to take your time, search for models, take some notes, and after you write the pros and cons of all those pillows that got your attention, choose the ones that meet all your criteria.