3 ply encapsulated base with aluminum core sandwiched between stainless steel layers Published October 13, 2014 at 1500 × 518 in All-Clad 59912 12-Quart Stainless Steel Pasta Pot with Steamer Insert Image of All Clad 12 quart stock pot 3 ply encapsulated base with aluminum core sandwiched between 18/10 stainless steel layers for even heat distribution