World Centric®; compostable vented clear lids for small (18 oz) takeout burrito bowls are made from PLA, (polymer made from plants). Great for warm or cold items, these lids are heat resistant up to 110°F and vented to prevent condensation. Not microwavable. PLA products should be stored in a cool place below 110° F and out of direct sunlight. They are certified compostable in a commercial facility, which may not exist in your area.