The material of an 18 oz vinyl banner is a heavy-duty, high-quality vinyl that is designed to withstand harsh weather conditions and repeated use. This material is typically a reinforced vinyl that has a thickness of 18 ounces per square yard, making it thicker and stronger than standard vinyl banners.

The reason why one would buy an 18 oz vinyl banner is that it provides a durable and long-lasting advertising or promotional display that can be used in various outdoor settings. The heavy-duty nature of this material ensures that it can withstand strong winds, rain, and sun exposure without tearing or fading, making it ideal for use in outdoor events and displays.

Additionally, the thick vinyl material of an 18 oz banner also provides a professional and polished look, making it an excellent choice for businesses or organizations looking to make a strong and lasting impression on their target audience. This type of banner is often used for trade shows, festivals, sports events, and other outdoor venues where large banners are needed to grab the attention of potential customers or attendees.