Cooling function. This high-quality thermos keeps coffee, tea, juice, or soda pleasantly cool or warm for a long time. The mouth-blown glass flask is made from double-walled insulating white glass. This design allows for optimal and long-lasting insulation through a vacuum and a special silver coating between the two glass flasks. When filled, the bottle achieves a heat retention time of approximately 24 hours and a cooling retention time of up to 36 hours. High-quality sealing rings and a reliable screw cap ensure long and dependable use. The thoughtful construction also allows for one-handed operation.