Made from rapidly renewable, unbleached bamboo paper. No trees are used to make NoTree™ cups. Double bio-linings made from plants -- inner lining creates moisture barrier and outer lining keeps cups from sweating. Disposable, freezer safe, and contain no wax or plastic lining. Great for all cold beverages, but can also hold liquids up to 220°F. 100% compostable in two to four months in a commercial composting facility. Not microwavable.