TRAVEL TUMBLER is designed for people who lead a conscious and flexible lifestylefor those who appreciate the subtle flavours of single-origin coffee and tea, or like to drink mineral water at the temperature that is just right for your body. The vacuum insulated tumbler has great heat and cold retention, and maintains the aroma and flavour of drinks for a long time. For maximum insulation efficiency, preheat or precool the tumbler prior to use by filling in a bit of hot/cold water for 1-2 mins. Do not put in dry ice or carbonated beverage as the product may expand and break. You can use it with dairy products, fruit juices, and sports drinks but we recommend not leaving the drink inside for too long as it may spoil or cause rust on tumbler. Immediately wash and dry well after use, then store it away from other metals to prevent rust. Wash with care. Do not use abrasive cleansers or steel wool. Do not use chlorine bleach as it may cause rust. When rust spots are found inside the tumbl