By adding a new patented Stainless Steel core this exclusive collection represents the next generation of bonded or "clad" cookware. All-Clad D5 construction consists of five alternating layers of stainless steel and aluminum that result in a new benchmark for durability even heating and energy efficiency. Patented Stainless Steel Core diffuses heat across the entire cooking surface for impeccable even browning. Patented layer composition resists warping. The All-Clad Stock Pot is essential t