To make an Insulated MontiiCo bottle, we first construct an inner and outer bottle, which are sealed together and welded shut to be completely air-tight. Then the bottle is connected to a high-power vacuum pump which removes all the air from the gap in between the inner and outer bottle. Since there’s nothing to conduct heat across the gap, vacuum insulation is more effective than foam or other common insulating materials like Styrofoam, a derivative of plastic. Vacuum insulation works so well, it is the technology of choice for cryogenic storage tanks and other high-performance insulating vessels. Our vacuum insulated bottle can keep your beverages hot or cold for hours and hours.