These 32 oz fiber bowls are made from surplus sugarcane and wheat straw agricultural fiber so they are 100% compostable. They are soak proof and contain no plastic or wax lining. They are certified to compost in 2-4 months in a commercial facility. This item is ASTM D-6400 certified. It’s grease and cut resistant, Microwave and freezer safesable, and suitable for use of foods up to 220 degrees Fahrenheit. It Conforms to FDA guidelines for food use.