Those compostable 12 oz clear cold cups are made from NatureWorks Ingeo,‚Ñ¢ which is derived from plants grown in the USA. These disposable cups are great for cold beverages such as iced coffee, iced tea, smoothies, and water. They are suitable for liquids up to 120¬∞F, freezer safe, eco friendly and compost in 2 to 4 months in a commercial composting facility. Even though they are as light and strong as plastic, these disposable cups fully break down when commercially composted. Not microwavable.