To improve the not-so-great conductivity of stainless steel, copper and/or aluminum is generally used to sandwich between two outer layers stainless steel. The multi-layer material retains heat longer and saves energy on all stovetops. Because the aluminum core runs from the base to rim, the entire contents of the pot or pan stays at the same temperature, ensuring even cooking. The equal distribution of heat eliminates hot spots, allowing you to cook the most delicate dishes. The higher the number of ply, the higher the price, the heavier the weight, and to a certain degree the better the performance. Its applications include browning meats, whisking delicate sauces, searing, glazing, sautéing and even frying.