WoW! This poncho is made from Corn starch: 100% compostable and 100% biodegradable. As the name implies, corn starch biodegradable and compostable products are made from corn starch. PLA (polyactic acid) is typically made from the sugars in corn starch, cassava or sugercane. It’s biodegradable, carbon-neutral and edible. To transfrom corn into plastic, corn kernels are immersed in sulfur dioxide and hot water, where its components break down into starch, protein and fiber.