Made from plant based NatureWorks Ingeo PLA compostable plastic. Manufacturing PLA produces 75% fewer greenhouse gases & uses 50% less non-renewable energy compared to conventional plastics made from petroleum. Great for all cold beverages such as iced coffee, iced tea, smoothies, & water, but can also hold liquids up to 120F. Freezer safe. Even though they are as light & strong as plastic, these disposable cups fully break down & are 100% compostable in two to four months in a commercial composting facility. Not microwavable. Cup Type: Cold Cup; Interior Volume Capacity: 12 oz; Material(s): PLA Compostable Plastic Derived from Plants; Material Type: Plastic.