Superior thermal insulation: Our thermal carafe locks in temperature for all day long adopted the 6-layer insulation technology. The unique red borosilicate glass liner is designed for inner vacuum insulation and the small opening and the rotary lid with food-grade silicone sealing ring that prevent the loss of heat ensure longer time of temperature retention. The copper plating liner is an addition to upgrade 20% of its heat retention performance compared with the white silver plating one.