Th All-Clad Stainless Steel 4-Quart Casserole with Lid features high, straight sides with a smaller surface area that holds heat well while limiting evaporation. The versatile casserole can be used to cook, warm and serve, with or without its lid, as the occasion demands. All-Clad's Stainless 3-ply cookware features a thick-gauge aluminum core that attracts heat fast, while the addition of stainless steel ensures even heat distribution for consistent results across the entire cooking surface.