Latex balloons, which are made from the sap of rubber trees, are generally considered biodegradable. Latex is a natural material that can break down over time when exposed to the elements (at the rate of an Oak Leaf). When a latex balloon is released outdoors or disposed of properly, it will eventually decompose and return to the environment. However, it's important to note that the decomposition process of latex balloons can take several months or even years, depending on the environmental conditions. Balloons that end up in bodies of water, such as rivers or oceans, can pose a risk to marine life before they fully biodegrade. On the other hand, foil balloons, also known as Mylar balloons, are not biodegradable. They are made from metallic-coated nylon or polyester materials, which do not break down naturally. Foil balloons can persist in the environment for a significant period of time, causing potential litter and environmental issues if not properly disposed of. To minimize the environmental impact of balloons, it is advisable to properly dispose of them after use and avoid releasing them into the environment. Many jurisdictions have regulations or guidelines in place to encourage responsible balloon use and disposal to protect wildlife and ecosystems.