World Centric® compostable 12 oz clear cold cups are made from PLA, which is derived from plants. These disposable cups are great for cold beverages such as iced coffee, iced tea, smoothies and water. They are suitable for cold liquids, 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. PLA products should be stored in a cool place below 110 deg F and out of direct sunlight.