Made from plant based PLA compostable plastic. Specially designed for cold beverage cups. Heat resistant up to 120°F and freezer safe. 100% compostable in two to four months in a commercial composting facility. Not microwavable. Flat Lid. Fits: 9 oz to 24 oz Cold Cups; Material Type: Plastic; Material(s): PLA Compostable Plastic Derived from Plants; Color(s): Clear.