There are only two types – foil and latex. The second are the most common, because they can be made in any color and desired shape. They are also considered more environmentally friendly than ordinary rubber balloons. It is not recommended to keep latex balloons in sunlight for a long time, because they will lose their original appearance and become cloudy in a short time. Foil balloons are created from mylar film, which resembles foil. They last much longer: from a few hours to several months.