100% Biodegradable and compostable, Certified by Biodegradable Products Institute (BPI).Soak proof. Bio lining is made from NatureWorks Ingeo™ Polylactic Acid (PLA) which is made from corn grown in The USA. White colored Paper is Elemental Chlorine Free (ECF). They are bleached without elemental chlorine. Heat tolerant up to 200 Fahrenheit. Good for hot beverages. Are perfect alternative to hot cups that are lined with Polyethylene. Compost in 1-2 months in a commercial composting system. Meet ASTM 6400 composability standards.