Stock your breakroom with these convenient hot cups Made of renewable resources for an eco-conscious design. PLA inner lining provides a leakproof seal without the use of conventional plastic. Made of Ingeo biopolymer, a natural plastic made from corn, for sustainability. Smooth, rolled rim for comfort and a secure lid fit. Exterior design features world map with land masses in white for a stylish look. Not recommended for microwaves. BPI Certified Compostable - certified by the Biodegradable Products Institute (BPI) to be compostable in commercial compost facilities (where facilities exist). Product Content Contains Compostable Material - made from materials that can quickly break down in commercial composting facilities (where facilities exist), to help reduce waste while creating usable organic matter.