the lid is stainless with a clear plastic/rubber? gasket that seals it for pressure. The outside of it is plastic but no plastic touches the food. I used the slow cooker function yesterday and it did great. I actually used it 3 times in a row-made a slow cooker chicken in it, stuck it in a covered bowl to keep warm, then pressured some apples (15 min of steam function with some cinnamon and a touch of sugar=completely mushy apples which is the way my family likes them) and then dumped them into a bowl and made rice. The rice turned out amazing too!