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 Sauté Pan is designed for sautéing, frying and searing, and is also well suited for preparing marinara and other sauces. The high sides serve to retain added liquids during cooking.