Insulation function. This versatile insulated jug offers much more than just its shiny surface: stylishly designed from top to bottom, with a comfortable handle and a rounded spout. This high-quality thermal jug keeps coffee, tea, juice, or iced tea pleasantly cool or warm for a long time. The mouth-blown glass flask is made from double-walled insulating borosilicate glass. This design allows for optimal and long-lasting insulation through vacuum and a special silver coating between the two glass flasks. When filled, the jug achieves a heat retention time of approximately 24 hours and a cold retention time of up to 36 hours. High-quality sealing rings and a reliable screw cap ensure long-lasting and dependable use.