Mylar balloons are made from a type of polyester film known for its shiny, metallic appearance. They are often used for celebrations like birthdays and holidays because they can be printed with colorful designs and messages. Unlike traditional latex balloons, Mylar balloons are more durable and can hold helium longer, making them a popular choice for events. These balloons come in various shapes and sizes, including popular characters and symbols. Mylar balloons are also reusable; they can be deflated and stored for future use. However, they should be disposed of properly, as they can pose a risk to wildlife if released into the environment.