Zwilling unique heavy base construction with a flat lid that fits the edges of your pot, high heat retention and superior heat transfer for the requirements of delicious cooking. The lid is made of glass to meet the needs of "looking to cook while making sure it works. In addition to frying, steaming, simmering and boiling dishes, it also allows for waterless dishes because it does not release moisture. The handle is also made of stainless steel, so if you remove the lid, it can be used in the oven.