Made from NatureWorks Ingeo compostable bioplastic NatureWorks Ingeo is derived from corn and made in the USA Are best used for beverages below 110F Need to be stored below 110F and away from heat; hot surfaces and direct sunlight 0 World Centric compostable cold cups are made from NatureWorks Ingeo; which is derived from plants grown in the USA. Our cups meet the most stringent scientific requirements for biodegradability and compostability; and are ASTM D6400-99 certified for compostable plastics. Even though they are as light and strong as plastic; they fully biodegrade when composted.