The Heirol coffee press (stainless steel) is made of stainless steel and is double-walled to keep the coffee warm for a long time. The coffee press has a thermos function and holds a full litre of liquid. Measure out the coffee in the bottom of the jug, pour in the water and stir. Put the lid on and let the coffee press stand for a few minutes before you press the lever and the coffee grounds down.