Heartland Bakeware produces AirGourmet, professional air insulated baking sheets and cake pans. The company is family owned and Grandma adds her favorite recipe to each cookie sheet. They proudly produce their bakeware in Salina, KS. Two sheets of professional quality aluminum are seperated by an insulating layer of air. The bottom sheet protects the top sheet from intense heat in the lower part of the oven. This resists bending and warping, and eliminates burning. Intended supports maintain the separation of top & bottom sheet.