Slow Cooker Liners are easy to use and save time and energy by eliminating the time-consuming cleanup. You can reduce or even eliminate the need for oil or cooking spray in your recipes when using a liner. If you decide to cook two different dishes at the same time in the slow cooker, they can help prevent the transfer of flavors from one dish to another. Slow cooker liners are designed to be used in slow cookers only. They are made of an FDA-compliant, BPA-free, heat-resistant nylon material that is safe for cooking on high, low, and warm slow cooker settings.