Tough, one piece, polyethylene shells filled with thick foam insulation. Combined with durable nylon latches and air-tight gaskets for top temperature holding performance. Extra large capacity with 12 molded-in rails on 1.5" centers to hold a combination of full size, 1/2 and 1/3 size pans. The door opens a full 270 degrees for easy loading and unloading. Units interlock for easy stacking or transporting. Available with or without Fahrenheit Thermometer.